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可变函数
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<h1 id="变量">变量</h1>
<ul>
<li><a href="#boolval">boolval - 获取变量的布尔值</a></li>
<li><a href="#debugzvaldump">debug_zval_dump - 打印变量的相关信息和被引用的次数</a></li>
<li><a href="#doubleval">doubleval - 获取变量的浮点值</a></li>
<li><a href="#empty">empty - 检查一个变量是否为空</a></li>
<li><a href="#floatval">floatval - 获取变量的浮点值</a></li>
<li><a href="#getdefinedvars">get_defined_vars - 返回由所有已定义变量所组成的数组</a></li>
<li><a href="#getresourcetype">get_resource_type - 返回资源类型</a></li>
<li><a href="#gettype">gettype - 获取变量的类型</a></li>
<li><a href="#intval">intval - 获取变量的整数值</a></li>
<li><a href="#isarray">is_array - 检测变量是否是数组</a></li>
<li><a href="#isbool">is_bool - 检测变量是否是布尔型</a></li>
<li><a href="#iscallable">is_callable - 检测参数是否为合法的可调用结构</a></li>
<li><a href="#iscountable">is_countable - 检测参数是否为可计数类型</a></li>
<li><a href="#isdouble">is_double - 检测变量是否是浮点型</a></li>
<li><a href="#isfloat">is_float - 检测变量是否是浮点型</a></li>
<li><a href="#isint">is_int - 检测变量是否是整数</a></li>
<li><a href="#isinteger">is_integer - 检测变量是否是整数</a></li>
<li><a href="#isiterable">is_iterable - 检测变量是否是可迭代类型</a></li>
<li><a href="#islong">is_long - 检测变量是否是整数</a></li>
<li><a href="#isnull">is_null - 检测变量是否为 NULL</a></li>
<li><a href="#isnumeric">is_numeric - 检测变量是否为数字或数字字符串</a></li>
<li><a href="#isobject">is_object - 检测变量是否是一个对象</a></li>
<li><a href="#isresource">is_resource - 检测变量是否为资源类型</a></li>
<li><a href="#isscalar">is_scalar - 检测变量是否是一个标量</a></li>
<li><a href="#isstring">is_string - 检测变量是否是字符串</a></li>
<li><a href="#isset">isset - 检测变量是否已设置并且非 NULL</a></li>
<li><a href="#printr">print_r - 以易于理解的格式打印变量</a></li>
<li><a href="#serialize">serialize - 产生一个可存储的值的表示</a></li>
<li><a href="#settype">settype - 设置变量的类型</a></li>
<li><a href="#strval">strval - 获取变量的字符串值</a></li>
<li><a href="#unserialize">unserialize - 从已存储的表示中创建 PHP 的值</a></li>
<li><a href="#unset">unset - 释放指定的变量</a></li>
<li><a href="#vardump">var_dump - 打印变量的相关信息</a></li>
<li><a href="#varexport">var_export - 输出或返回一个变量的字符串表示</a></li>
</ul>
<h2 id="boolval">boolval</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token number">0.0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0.00'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'false'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token boolean constant">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token number">2.3e5</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">2</span><span class="token punctuation">,</span> <span class="token number">4</span><span class="token punctuation">,</span> <span class="token number">5</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">boolval</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="debugzvaldump">debug_zval_dump</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'foo'</span><span class="token punctuation">;</span>
<span class="token function">debug_zval_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(3) "foo" refcount(1)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'foo'</span><span class="token punctuation">;</span>
<span class="token variable">$bar</span> <span class="token operator">=</span> <span class="token operator">&</span><span class="token variable">$foo</span><span class="token punctuation">;</span>
<span class="token function">debug_zval_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token variable">$bar</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(3) "foo" refcount(1) string(3) "foo" refcount(1)</span>
</code></pre>
<h2 id="doubleval">doubleval</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">doubleval</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// float(-0.0001)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">doubleval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'abc122.34343'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// float(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">doubleval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'122.34343abc'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// float(122.34343)</span>
</code></pre>
<h2 id="empty">empty</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token number">0.0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token single-quoted-string string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'false'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'1'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">empty</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="floatval">floatval</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">floatval</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// float(-0.0001)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">floatval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'abc122.34343'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// float(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">floatval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'122.34343abc'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// float(122.34343)</span>
</code></pre>
<h2 id="getdefinedvars">get_defined_vars</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">get_defined_vars</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h2 id="getresourcetype">get_resource_type</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">get_resource_type</span><span class="token punctuation">(</span><span class="token function">tmpfile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(6) "stream"</span>
</code></pre>
<h2 id="gettype">gettype</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token boolean constant">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(7) "boolean"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(7) "integer"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(6) "double"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(6) "string"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(5) "array"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(6) "object"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token function">tmpfile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(8) "resource"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">gettype</span><span class="token punctuation">(</span><span class="token constant">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(4) "NULL"</span>
</code></pre>
<h2 id="intval">intval</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">42</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(-42)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">42</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(42)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">4.2</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(4)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'+42'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(42)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'-42'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(-42)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">1e7</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(10000000)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'1e7'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(10000000)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">0</span>b11<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(3)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0b11'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">042</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(34)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'042'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(42)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">0x99</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(153)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0x99'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(1)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token number">42</span><span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(42)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">intval</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'42'</span><span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(34)</span>
</code></pre>
<h2 id="isarray">is_array</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_array</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_array</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_array</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'foo'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token single-quoted-string string">'cat'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'bar'</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token single-quoted-string string">'dog'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="isbool">is_bool</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_bool</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_bool</span><span class="token punctuation">(</span><span class="token boolean constant">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_bool</span><span class="token punctuation">(</span><span class="token boolean constant">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="iscallable">is_callable</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token comment">/**
* Just a test function.
*
* @param void
* @return void
*/</span>
<span class="token keyword">function</span> <span class="token function">foo</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
* Just a test function.
*
* @param void
* @return void
*/</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">Foo</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param void
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">method</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">class</span> <span class="token class-name">Bar</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param void
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">function</span> <span class="token function">method</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">class</span> <span class="token class-name">Baz</span> <span class="token keyword">extends</span> <span class="token class-name">Foo</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Override the parent method.
*
* @param void
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">method</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">class</span> <span class="token class-name">Qux</span> <span class="token keyword">extends</span> <span class="token class-name">Bar</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Override the parent method.
*
* @param void
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">function</span> <span class="token function">method</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">class</span> <span class="token class-name">Quux</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* This method is called when tries to call an object as a function.
*
* @param void
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">__invoke</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'print'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token keyword">new</span> <span class="token class-name">Foo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'method'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'Bar'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'method'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'Bar::method'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token keyword">new</span> <span class="token class-name">Baz</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'parent::method'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'Qux'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'parent::method'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Quux</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo'</span><span class="token punctuation">,</span> <span class="token boolean constant">false</span><span class="token punctuation">,</span> <span class="token variable">$callable_name</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_callable</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'print'</span><span class="token punctuation">,</span> <span class="token boolean constant">true</span><span class="token punctuation">,</span> <span class="token variable">$callable_name</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="iscountable">is_countable</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_countable</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_countable</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_countable</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_countable</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">ArrayIterator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="isdouble">is_double</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_double</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_double</span><span class="token punctuation">(</span><span class="token number">27.25</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_double</span><span class="token punctuation">(</span><span class="token number">1e7</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="isfloat">is_float</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_float</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_float</span><span class="token punctuation">(</span><span class="token number">27.25</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_float</span><span class="token punctuation">(</span><span class="token number">1e7</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="isint">is_int</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_int</span><span class="token punctuation">(</span><span class="token number">23</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_int</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'23'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_int</span><span class="token punctuation">(</span><span class="token number">23.5</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isinteger">is_integer</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_integer</span><span class="token punctuation">(</span><span class="token number">23</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_integer</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'23'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_integer</span><span class="token punctuation">(</span><span class="token number">23.5</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isiterable">is_iterable</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_iterable</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_iterable</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_iterable</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_iterable</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">ArrayIterator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="islong">is_long</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_long</span><span class="token punctuation">(</span><span class="token number">23</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_long</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'23'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_long</span><span class="token punctuation">(</span><span class="token number">23.5</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isnull">is_null</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_null</span><span class="token punctuation">(</span><span class="token constant">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_null</span><span class="token punctuation">(</span><span class="token single-quoted-string string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_null</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isnumeric">is_numeric</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_numeric</span><span class="token punctuation">(</span><span class="token number">3</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_numeric</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'3'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_numeric</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'1.2'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_numeric</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'1.2a'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isobject">is_object</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_object</span><span class="token punctuation">(</span><span class="token constant">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_object</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_object</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="isresource">is_resource</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_resource</span><span class="token punctuation">(</span><span class="token constant">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_resource</span><span class="token punctuation">(</span><span class="token function">tmpfile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_resource</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isscalar">is_scalar</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token number">0.1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token boolean constant">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token function">tmpfile</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_scalar</span><span class="token punctuation">(</span><span class="token constant">null</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="isstring">is_string</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_string</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_string</span><span class="token punctuation">(</span><span class="token single-quoted-string string">''</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">is_string</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'0'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="isset">isset</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token constant">null</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">''</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token variable">$bar</span> <span class="token operator">=</span> <span class="token constant">null</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token variable">$bar</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">''</span><span class="token punctuation">;</span>
<span class="token variable">$bar</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token variable">$bar</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token constant">null</span><span class="token punctuation">;</span>
<span class="token variable">$bar</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token variable">$bar</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(false)</span>
</code></pre>
<h2 id="printr">print_r</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">print_r</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// Array ( [0] => 0 [1] => 1 [2] => 2 )</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token function">print_r</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token boolean constant">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(49) "Array ( [0] => 0 [1] => 1 [2] => 2 ) "</span>
</code></pre>
<h2 id="serialize">serialize</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">serialize</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(4) "i:0;"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">serialize</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(30) "a:3:{i:0;i:0;i:1;i:1;i:2;i:2;}"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">serialize</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(19) "O:8:"stdClass":0:{}"</span>
</code></pre>
<h2 id="settype">settype</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'string'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(1) "0"</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token boolean constant">true</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'string'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(1) "1"</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'122.34343abc'</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'integer'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(122)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'abc122.34343'</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'integer'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'true'</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'bool'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'false'</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">settype</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'bool'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// bool(true)</span>
</code></pre>
<h2 id="strval">strval</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">strval</span><span class="token punctuation">(</span><span class="token operator">-</span><span class="token number">10</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(3) "-10"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">strval</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(1) "0"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">strval</span><span class="token punctuation">(</span><span class="token number">0.0001</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(6) "0.0001"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">strval</span><span class="token punctuation">(</span><span class="token boolean constant">true</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(1) "1"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">strval</span><span class="token punctuation">(</span><span class="token boolean constant">false</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(0) ""</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">strval</span><span class="token punctuation">(</span><span class="token number">1e7</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(8) "10000000"</span>
</code></pre>
<h2 id="unserialize">unserialize</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">unserialize</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'i:0;'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">unserialize</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'a:3:{i:0;i:0;i:1;i:1;i:2;i:2;}'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) }</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">unserialize</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'O:8:"stdClass":0:{}'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// object(stdClass)#1 (0) { }</span>
</code></pre>
<h2 id="unset">unset</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">unset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// NULL</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">unset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// array(2) { [1]=> int(1) [2]=> int(2) }</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">unset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// NULL</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token variable">$bar</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">unset</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">,</span> <span class="token variable">$bar</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// NULL</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$bar</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// NULL</span>
</code></pre>
<h2 id="vardump">var_dump</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) }</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">stdClass</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(0) array(3) { [0]=> int(0) [1]=> int(1) [2]=> int(2) } object(stdClass)#1 (0) { }</span>
</code></pre>
<h2 id="varexport">var_export</h2>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token function">var_export</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// array ( 0 => 0, 1 => 1, 2 => 2, )</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token function">var_export</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token boolean constant">true</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token variable">$foo</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(39) "array ( 0 => 0, 1 => 1, 2 => 2, )"</span>
</code></pre>
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