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返回值
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可变函数
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类与对象
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构造函数和析构函数
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对象继承
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Static 关键字
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抽象类
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对象接口
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Trait
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遍历对象
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魔术方法
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Final 关键字
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对象复制
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对象比较
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<h1 id="url">URL</h1>
<ul>
<li><a href="#base64decode">base64_decode - 对使用 MIME base64 编码的数据进行解码</a></li>
<li><a href="#base64encode">base64_encode - 使用 MIME base64 对数据进行编码</a></li>
<li><a href="#getheaders">get_headers - 取得服务器响应一个 HTTP 请求所发送的所有报头</a></li>
<li><a href="#getmetatags">get_meta_tags - 从一个文件中提取所有的 meta 标签 content 属性，返回一个数组</a></li>
<li><a href="#httpbuildquery">http_build_query - 生成 URL-encode 之后的请求字符串</a></li>
<li><a href="#parseurl">parse_url - 解析 URL ，返回其组成部分</a></li>
<li><a href="#rawurldecode">rawurldecode - 对已编码的 URL 字符串进行解码</a></li>
<li><a href="#rawurlencode">rawurlencode - 按照 RFC 3986 对 URL 进行编码</a></li>
<li><a href="#urldecode">urldecode - 对已编码的 URL 字符串进行解码</a></li>
<li><a href="#urlencode">urlencode - 编码 URL 字符串</a></li>
</ul>
<h2 id="base64decode">base64_decode</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">base64_decode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'Zm9v'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(3) "foo"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">base64_decode</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">// string(0) ""</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">base64_decode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'_'</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(false)</span>
</code></pre>
<h2 id="base64encode">base64_encode</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">base64_encode</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(4) "Zm9v"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">base64_encode</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">// string(4) "Xw=="</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">base64_encode</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">// string(4) "IA=="</span>
</code></pre>
<h2 id="getheaders">get_headers</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_headers</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'https://github.com/'</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 function">get_headers</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'https://github.com/'</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>
</code></pre>
<h2 id="getmetatags">get_meta_tags</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_meta_tags</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'https://github.com/'</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 function">get_meta_tags</span><span class="token punctuation">(</span><span class="token constant">__DIR__</span> <span class="token punctuation">.</span> <span class="token single-quoted-string string">'/example.html'</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>
</code></pre>
<p>上例中的 <code>example.html</code> 文件内容：</p>
<pre class="language-"><code class="lang-html"><span class="token doctype"><!DOCTYPE html></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>html</span> <span class="token attr-name">lang</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>zh-cmn-Hans<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">charset</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>utf-8<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>foo<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>foo<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>meta</span> <span class="token attr-name">name</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>bar<span class="token punctuation">"</span></span> <span class="token attr-name">content</span><span class="token attr-value"><span class="token punctuation">=</span><span class="token punctuation">"</span>bar<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>head</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"><</span>p</span><span class="token punctuation">></span></span><span class="token tag"><span class="token tag"><span class="token punctuation"></</span>p</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>body</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>html</span><span class="token punctuation">></span></span>
</code></pre>
<h2 id="httpbuildquery">http_build_query</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">http_build_query</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">// string(15) "foo=cat&bar=dog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">http_build_query</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 punctuation">[</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 punctuation">;</span> <span class="token comment">// string(22) "foo=cat&bar%5B0%5D=dog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">http_build_query</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'foo'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'bar'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'prefix_'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(25) "prefix_0=foo&prefix_1=bar"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">http_build_query</span><span class="token punctuation">(</span><span class="token punctuation">[</span><span class="token single-quoted-string string">'foo'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'bar'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'prefix_'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'&amp;'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(29) "prefix_0=foo&amp;prefix_1=bar"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">http_build_query</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 dog'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'prefix_'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'&amp;'</span><span class="token punctuation">,</span> <span class="token constant">PHP_QUERY_RFC1738</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(11) "foo=cat+dog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">http_build_query</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 dog'</span><span class="token punctuation">]</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'prefix_'</span><span class="token punctuation">,</span> <span class="token single-quoted-string string">'&amp;'</span><span class="token punctuation">,</span> <span class="token constant">PHP_QUERY_RFC3986</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(13) "foo=cat%20dog"</span>
</code></pre>
<h2 id="parseurl">parse_url</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">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// array(8) { ["scheme"]=> string(4) "http" ["host"]=> string(8) "hostname" ["port"]=> int(80) ["user"]=> string(8) "username" ["pass"]=> string(8) "password" ["path"]=> string(5) "/path" ["query"]=> string(9) "arg=value" ["fragment"]=> string(6) "anchor" }</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_SCHEME</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(4) "http"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_HOST</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(8) "hostname"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_PORT</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// int(80)</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_USER</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(8) "username"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_PASS</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(8) "password"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_PATH</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(5) "/path"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_QUERY</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(9) "arg=value"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">parse_url</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'http://username:password@hostname:80/path?arg=value#anchor'</span><span class="token punctuation">,</span> <span class="token constant">PHP_URL_FRAGMENT</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(6) "anchor"</span>
</code></pre>
<h2 id="rawurldecode">rawurldecode</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">rawurldecode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo%3Dcat%26bar%3Ddog'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(15) "foo=cat&bar=dog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">rawurldecode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo%3Dcat%26bar%3D%20dog%20'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(17) "foo=cat&bar= dog "</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">rawurldecode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo%3Dcat%26bar%3Ddog+bird'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(20) "foo=cat&bar=dog+bird"</span>
</code></pre>
<h2 id="rawurlencode">rawurlencode</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">rawurlencode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo=cat&bar=dog'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(21) "foo%3Dcat%26bar%3Ddog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">rawurlencode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo=cat&bar= dog '</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(27) "foo%3Dcat%26bar%3D%20dog%20"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">rawurlencode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo=cat&bar=dog bird'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(28) "foo%3Dcat%26bar%3Ddog%20bird"</span>
</code></pre>
<h2 id="urldecode">urldecode</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">urldecode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo%3Dcat%26bar%3Ddog'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(15) "foo=cat&bar=dog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">urldecode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo%3Dcat%26bar%3D%20dog%20'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(17) "foo=cat&bar= dog "</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">urldecode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo%3Dcat%26bar%3Ddog+bird'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(20) "foo=cat&bar=dog bird"</span>
</code></pre>
<h2 id="urlencode">urlencode</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">urlencode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo=cat&bar=dog'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(21) "foo%3Dcat%26bar%3Ddog"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">urlencode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo=cat&bar= dog '</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(23) "foo%3Dcat%26bar%3D+dog+"</span>
<span class="token function">var_dump</span><span class="token punctuation">(</span><span class="token function">urlencode</span><span class="token punctuation">(</span><span class="token single-quoted-string string">'foo=cat&bar=dog bird'</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// string(26) "foo%3Dcat%26bar%3Ddog+bird"</span>
</code></pre>
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