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Array 数组
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Object 对象
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Resource 资源类型
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NULL
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Callable 可调用类型
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类型转换的判别
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变量
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基本语法
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变量范围
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可变变量
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来自 PHP 之外的变量
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常量
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基本语法
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魔术常量
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表达式
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运算符
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运算符优先级
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算数运算符
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赋值运算符
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位运算符
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比较运算符
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错误控制运算符
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执行运算符
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递增递减运算符
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逻辑运算符
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字符串运算符
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数组运算符
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类型运算符
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流程控制
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if
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else
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elseif
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while
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do-while
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for
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foreach
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switch
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break
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continue
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流程控制的替代语法
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declare
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return
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require
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include
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require_once
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<a href="../语言参考/流程控制/include_once.html">
include_once
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<a href="../语言参考/流程控制/goto.html">
goto
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<li class="chapter " data-level="1.1.1.8" data-path="../语言参考/函数.html">
<a href="../语言参考/函数.html">
函数
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用户自定义函数
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函数的参数
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<a href="../语言参考/函数/返回值.html">
返回值
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<li class="chapter " data-level="1.1.1.8.4" data-path="../语言参考/函数/可变函数.html">
<a href="../语言参考/函数/可变函数.html">
可变函数
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<a href="../语言参考/函数/匿名函数.html">
匿名函数
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<li class="chapter " data-level="1.1.1.9" data-path="../语言参考/类与对象.html">
<a href="../语言参考/类与对象.html">
类与对象
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<a href="../语言参考/类与对象/基本语法.html">
基本语法
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<a href="../语言参考/类与对象/属性.html">
属性
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<a href="../语言参考/类与对象/类常量.html">
类常量
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类的自动加载
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<a href="../语言参考/类与对象/构造函数和析构函数.html">
构造函数和析构函数
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<a href="../语言参考/类与对象/访问控制.html">
访问控制
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<li class="chapter " data-level="1.1.1.9.7" data-path="../语言参考/类与对象/对象继承.html">
<a href="../语言参考/类与对象/对象继承.html">
对象继承
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<li class="chapter " data-level="1.1.1.9.8" data-path="../语言参考/类与对象/范围解析操作符.html">
<a href="../语言参考/类与对象/范围解析操作符.html">
范围解析操作符
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</li>
<li class="chapter " data-level="1.1.1.9.9" data-path="../语言参考/类与对象/Static 关键字.html">
<a href="../语言参考/类与对象/Static 关键字.html">
Static 关键字
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</li>
<li class="chapter " data-level="1.1.1.9.10" data-path="../语言参考/类与对象/抽象类.html">
<a href="../语言参考/类与对象/抽象类.html">
抽象类
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</li>
<li class="chapter " data-level="1.1.1.9.11" data-path="../语言参考/类与对象/对象接口.html">
<a href="../语言参考/类与对象/对象接口.html">
对象接口
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<li class="chapter " data-level="1.1.1.9.12" data-path="../语言参考/类与对象/Trait.html">
<a href="../语言参考/类与对象/Trait.html">
Trait
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<li class="chapter " data-level="1.1.1.9.13" data-path="../语言参考/类与对象/匿名类.html">
<a href="../语言参考/类与对象/匿名类.html">
匿名类
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</li>
<li class="chapter " data-level="1.1.1.9.14" data-path="../语言参考/类与对象/重载.html">
<a href="../语言参考/类与对象/重载.html">
重载
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</li>
<li class="chapter " data-level="1.1.1.9.15" data-path="../语言参考/类与对象/遍历对象.html">
<a href="../语言参考/类与对象/遍历对象.html">
遍历对象
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</li>
<li class="chapter " data-level="1.1.1.9.16" data-path="../语言参考/类与对象/魔术方法.html">
<a href="../语言参考/类与对象/魔术方法.html">
魔术方法
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</li>
<li class="chapter " data-level="1.1.1.9.17" data-path="../语言参考/类与对象/Final 关键字.html">
<a href="../语言参考/类与对象/Final 关键字.html">
Final 关键字
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</li>
<li class="chapter " data-level="1.1.1.9.18" data-path="../语言参考/类与对象/对象复制.html">
<a href="../语言参考/类与对象/对象复制.html">
对象复制
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</li>
<li class="chapter " data-level="1.1.1.9.19" data-path="../语言参考/类与对象/对象比较.html">
<a href="../语言参考/类与对象/对象比较.html">
对象比较
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对象和引用
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对象序列化
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命名空间
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基本语法
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定义子命名空间
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使用命名空间 - 基础
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命名空间和动态语言特征
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namespace 关键字和 __NAMESPACE__ 魔术常量
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使用命名空间 - 别名和导入
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全局空间
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使用命名空间 - 后备全局函数和常量
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</li>
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名称解析规则
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Errors
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<li class="chapter " data-level="1.1.1.12" data-path="../语言参考/异常处理.html">
<a href="../语言参考/异常处理.html">
异常处理
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基本语法
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<a href="../语言参考/异常处理/扩展 PHP 内置的异常处理类.html">
扩展 PHP 内置的异常处理类
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</ul>
</li>
<li class="chapter " data-level="1.1.1.13" data-path="../语言参考/生成器.html">
<a href="../语言参考/生成器.html">
生成器
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生成器总览
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生成器语法
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生成器与 Iterator 对象比较
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</ul>
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引用的解释
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引用是什么
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引用不是什么
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引用做什么
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引用传递
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引用返回
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取消引用
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引用定位
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预定义变量
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超全局变量
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<a href="../语言参考/预定义变量/$GLOBALS.html">
$GLOBALS
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$_GET
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$_POST
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$_COOKIE
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$_REQUEST
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$_FILES
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$_SESSION
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<a href="../语言参考/预定义变量/$_SERVER.html">
$_SERVER
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$_ENV
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$http_response_header
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<a href="../语言参考/预定义变量/$argc.html">
$argc
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</li>
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<a href="../语言参考/预定义变量/$argv.html">
$argv
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</li>
</ul>
</li>
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预定义异常
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<li class="chapter " data-level="1.1.1.16.1" data-path="../语言参考/预定义异常/Exception.html">
<a href="../语言参考/预定义异常/Exception.html">
Exception
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</li>
<li class="chapter " data-level="1.1.1.16.2" data-path="../语言参考/预定义异常/ErrorException.html">
<a href="../语言参考/预定义异常/ErrorException.html">
ErrorException
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</li>
</ul>
</li>
<li class="chapter " data-level="1.1.1.17" data-path="../语言参考/预定义接口.html">
<a href="../语言参考/预定义接口.html">
预定义接口
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<ul class="articles">
<li class="chapter " data-level="1.1.1.17.1" data-path="../语言参考/预定义接口/Traversable.html">
<a href="../语言参考/预定义接口/Traversable.html">
Traversable
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</li>
<li class="chapter " data-level="1.1.1.17.2" data-path="../语言参考/预定义接口/Iterator.html">
<a href="../语言参考/预定义接口/Iterator.html">
Iterator
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</li>
<li class="chapter " data-level="1.1.1.17.3" data-path="../语言参考/预定义接口/IteratorAggregate.html">
<a href="../语言参考/预定义接口/IteratorAggregate.html">
IteratorAggregate
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</li>
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<a href="../语言参考/预定义接口/ArrayAccess.html">
ArrayAccess
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</li>
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<a href="../语言参考/预定义接口/Serializable.html">
Serializable
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</li>
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<a href="../语言参考/预定义接口/Closure.html">
Closure
</a>
</li>
<li class="chapter " data-level="1.1.1.17.7" data-path="../语言参考/预定义接口/Generator.html">
<a href="../语言参考/预定义接口/Generator.html">
Generator
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.1.1.18" data-path="../语言参考/上下文选项和参数.html">
<a href="../语言参考/上下文选项和参数.html">
上下文选项和参数
</a>
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<a href="../语言参考/上下文选项和参数/套接字上下文选项.html">
套接字上下文选项
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</li>
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<a href="../语言参考/上下文选项和参数/HTTP 上下文选项.html">
HTTP 上下文选项
</a>
</li>
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FTP 上下文选项
</a>
</li>
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<a href="../语言参考/上下文选项和参数/SSL 上下文选项.html">
SSL 上下文选项
</a>
</li>
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<a href="../语言参考/上下文选项和参数/CURL 上下文选项.html">
CURL 上下文选项
</a>
</li>
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<a href="../语言参考/上下文选项和参数/Phar 上下文选项.html">
Phar 上下文选项
</a>
</li>
<li class="chapter " data-level="1.1.1.18.7" data-path="../语言参考/上下文选项和参数/MongoDB 上下文选项.html">
<a href="../语言参考/上下文选项和参数/MongoDB 上下文选项.html">
MongoDB 上下文选项
</a>
</li>
<li class="chapter " data-level="1.1.1.18.8" data-path="../语言参考/上下文选项和参数/Context 参数.html">
<a href="../语言参考/上下文选项和参数/Context 参数.html">
Context 参数
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="1.1.1.19" data-path="../语言参考/支持的协议和封装协议.html">
<a href="../语言参考/支持的协议和封装协议.html">
支持的协议和封装协议
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<ul class="articles">
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<a href="../语言参考/支持的协议和封装协议/file.html">
file://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.2" data-path="../语言参考/支持的协议和封装协议/http.html">
<a href="../语言参考/支持的协议和封装协议/http.html">
http://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.3" data-path="../语言参考/支持的协议和封装协议/ftp.html">
<a href="../语言参考/支持的协议和封装协议/ftp.html">
ftp://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.4" data-path="../语言参考/支持的协议和封装协议/php.html">
<a href="../语言参考/支持的协议和封装协议/php.html">
php://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.5" data-path="../语言参考/支持的协议和封装协议/zlib.html">
<a href="../语言参考/支持的协议和封装协议/zlib.html">
zlib://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.6" data-path="../语言参考/支持的协议和封装协议/data.html">
<a href="../语言参考/支持的协议和封装协议/data.html">
data://
</a>
</li>
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<a href="../语言参考/支持的协议和封装协议/global.html">
global://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.8" data-path="../语言参考/支持的协议和封装协议/phar.html">
<a href="../语言参考/支持的协议和封装协议/phar.html">
phar://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.9" data-path="../语言参考/支持的协议和封装协议/ssh2.html">
<a href="../语言参考/支持的协议和封装协议/ssh2.html">
ssh2://
</a>
</li>
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<a href="../语言参考/支持的协议和封装协议/rar.html">
rar://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.11" data-path="../语言参考/支持的协议和封装协议/ogg.html">
<a href="../语言参考/支持的协议和封装协议/ogg.html">
ogg://
</a>
</li>
<li class="chapter " data-level="1.1.1.19.12" data-path="../语言参考/支持的协议和封装协议/expect.html">
<a href="../语言参考/支持的协议和封装协议/expect.html">
expect://
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="1.1.2" data-path="../函数参考.html">
<a href="../函数参考.html">
函数参考
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<a href="../函数参考/影响 PHP 行为的扩展.html">
影响 PHP 行为的扩展
</a>
<ul class="articles">
<li class="chapter " data-level="1.1.2.1.1" data-path="../函数参考/影响 PHP 行为的扩展/错误处理和日志记录.html">
<a href="../函数参考/影响 PHP 行为的扩展/错误处理和日志记录.html">
错误处理和日志记录
</a>
</li>
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<a href="../函数参考/影响 PHP 行为的扩展/输出缓冲控制.html">
输出缓冲控制
</a>
</li>
<li class="chapter " data-level="1.1.2.1.3" data-path="../函数参考/影响 PHP 行为的扩展/PHP 选项和信息.html">
<a href="../函数参考/影响 PHP 行为的扩展/PHP 选项和信息.html">
PHP 选项和信息
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</li>
</ul>
</li>
<li class="chapter " data-level="1.1.2.2" data-path="../函数参考/加密扩展.html">
<a href="../函数参考/加密扩展.html">
加密扩展
</a>
<ul class="articles">
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Hash
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OpenSSL
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密码散列算法
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数据库扩展
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数据库抽象层
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PDO
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日期与时间相关扩展
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日期与时间
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文件系统相关扩展
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目录
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文件系统
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国际化与字符编码支持
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iconv
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多字节字符串
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图像生成和处理
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GD
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邮件相关扩展
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数学扩展
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任意精度数学
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数学
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进程控制扩展
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程序执行
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其他基本扩展
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JSON
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杂项
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PHP 标准库
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Streams
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Tokenizer
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URL
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其他服务
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cURL
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网络
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Sockets
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Session 扩展
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Session
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文本处理
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正则表达式
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字符串
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变量与类型相关扩展
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数组
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类与对象
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字符类型检测
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过滤器
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函数处理
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反射
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变量
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XML 操作
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SimpleXML
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XML 解析器
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会话和安全
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会话管理基础
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和会话安全相关的配置项
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PHP 的命令行模式
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内置的 Web 服务器
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和命令行模式相关的配置项
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垃圾回收机制
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PHP 类型比较表
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PSR
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PSR-1 基础编码规范
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PSR-4 自动加载规范
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PSR-12 编码规范扩充
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<a href="../.." >PSR-12 编码规范扩充</a>
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<h1 id="psr-12-编码规范扩充">PSR-12 编码规范扩充</h1>
<ul>
<li><a href="#总则">总则</a><ul>
<li><a href="#基本编码准则">基本编码准则</a></li>
<li><a href="#文件">文件</a></li>
<li><a href="#行">行</a></li>
<li><a href="#缩进">缩进</a></li>
<li><a href="#关键字和类型">关键字和类型</a></li>
</ul>
</li>
<li><a href="#声明和命名空间以及导入">声明和命名空间以及导入</a></li>
<li><a href="#类和属性和方法">类和属性和方法</a><ul>
<li><a href="#继承和实现">继承和实现</a></li>
<li><a href="#使用-trait">使用 Trait</a></li>
<li><a href="#属性和常量">属性和常量</a></li>
<li><a href="#方法和函数">方法和函数</a></li>
<li><a href="#方法和函数参数">方法和函数参数</a></li>
<li><a href="#abstract-和-final-和-static">abstract 和 final 和 static</a></li>
<li><a href="#方法和函数的调用">方法和函数的调用</a></li>
</ul>
</li>
<li><a href="#流程控制">流程控制</a><ul>
<li><a href="#if-和-elseif-和-else">if 和 elseif 和 else</a></li>
<li><a href="#switch-和-case">switch 和 case</a></li>
<li><a href="#while-和-do-while">while 和 do-while</a></li>
<li><a href="#for">for</a></li>
<li><a href="#foreach">foreach</a></li>
<li><a href="#try-和-catch-和-finally">try 和 catch 和 finally</a></li>
</ul>
</li>
<li><a href="#运算符">运算符</a><ul>
<li><a href="#一元运算符">一元运算符</a></li>
<li><a href="#二元运算符">二元运算符</a></li>
<li><a href="#三元运算符">三元运算符</a></li>
</ul>
</li>
<li><a href="#闭包">闭包</a></li>
<li><a href="#匿名类">匿名类</a></li>
</ul>
<h2 id="总则">总则</h2>
<h3 id="基本编码准则">基本编码准则</h3>
<blockquote>
<p>代码 <strong>必须</strong> 遵循 PSR-1 中的所有规范。</p>
<p>PSR-1 中的术语 <code>StudlyCaps</code> <strong>必须</strong> 解释为 <code>PascalCase</code> ，其中每个单词的首字母大写，包括首字母。</p>
</blockquote>
<h3 id="文件">文件</h3>
<blockquote>
<p>所有 PHP 文件 <strong>必须</strong> 使用 Unix 的 <code>LF</code> 作为行的结束符。</p>
<p>所有 PHP 文件 <strong>必须</strong> 以非空行结尾，并且使用 Unix 的 <code>LF</code> 结尾。</p>
<p>在仅包含 PHP 代码的文件中， <strong>必须</strong> 省略结尾的 <code>?></code> 结束标签。</p>
</blockquote>
<h3 id="行">行</h3>
<blockquote>
<p>行的长度 <strong>一定不可</strong> 有硬性的约束。</p>
<p>行的长度的软性约束 <strong>必须</strong> 要限制在 120 个字符以内。</p>
<p>每行 <strong>不该</strong> 多于 80 个字符，大于 80 字符的行 <strong>应该</strong> 折成多行。</p>
<p>行尾 <strong>一定不可</strong> 有多余的空格符。</p>
<p><strong>可以</strong> 添加空行以提高可读性并指示相关的代码块，除非明确禁止。</p>
<p>每行 <strong>一定不可</strong> 存在多于一条语句。</p>
</blockquote>
<h3 id="缩进">缩进</h3>
<blockquote>
<p>代码 <strong>必须</strong> 使用 4 个空格符的缩进， <strong>一定不可</strong> 用 Tab 键。</p>
</blockquote>
<h3 id="关键字和类型">关键字和类型</h3>
<blockquote>
<p>PHP 所有关键字 <strong>必须</strong> 全部小写。</p>
<p>PHP 未来版本中新添加的所有关键字和类型也都 <strong>必须</strong> 使用小写。</p>
<p>类型关键字 <strong>必须</strong> 使用缩写，使用 <code>bool</code> 而不是 <code>boolean</code> ，使用 <code>int</code> 而不是 <code>integer</code> 等等。</p>
</blockquote>
<h2 id="声明和命名空间以及导入">声明和命名空间以及导入</h2>
<blockquote>
<p>一个 PHP 文件的头部 <strong>可能</strong> 会包含多个块，如果包含多个块，则每个块都 <strong>必须</strong> 用空白行和其他块分隔，并且同样的块内 <strong>不能</strong> 包含空白行。</p>
<p>所有的块都 <strong>必须</strong> 按照下面的顺序排列，如果不存在该块则忽略。</p>
<ul>
<li>PHP 文件开始标签 <code><?php</code></li>
<li>文件级文档块</li>
<li>一个或多个声明语句</li>
<li>命名空间声明语句</li>
<li>一个或多个基于类的 <code>use</code> 声明语句</li>
<li>一个或多个基于方法的 <code>use</code> 声明语句</li>
<li>一个或多个基于常量的 <code>use</code> 声明语句</li>
<li>其余代码</li>
</ul>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">declare</span><span class="token punctuation">(</span>strict_types<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>ClassA</span> <span class="token keyword">as</span> <span class="token constant">A</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>ClassB</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>ClassC</span> <span class="token keyword">as</span> <span class="token constant">C</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">function</span> Vendor\<span class="token package">Package<span class="token punctuation">\</span>functionA</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">function</span> Vendor\<span class="token package">Package<span class="token punctuation">\</span>functionB</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">function</span> Vendor\<span class="token package">Package<span class="token punctuation">\</span>functionC</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">const</span> Vendor\<span class="token package">Package<span class="token punctuation">\</span>CONSTANT_A</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">const</span> Vendor\<span class="token package">Package<span class="token punctuation">\</span>CONSTANT_B</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">const</span> Vendor\<span class="token package">Package<span class="token punctuation">\</span>CONSTANT_C</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>当希望在 PHP 代码外部包含标记的文件中声明严格类型时打开和关闭标签，声明 <strong>必须</strong> 写在文件的第一行，并且包含在第一个开始的 PHP 标签中。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span> <span class="token keyword">declare</span><span class="token punctuation">(</span>strict_types<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token operator">?</span><span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">!</span><span class="token constant">DOCTYPE</span> html<span class="token operator">></span>
<span class="token operator"><</span>html<span class="token operator">></span>
<span class="token operator"><</span>head<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>head<span class="token operator">></span>
<span class="token operator"><</span>body<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">?</span>php
<span class="token comment">//</span>
<span class="token operator">?</span><span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>body<span class="token operator">></span>
<span class="token operator"><</span><span class="token operator">/</span>html<span class="token operator">></span>
</code></pre>
<blockquote>
<p>声明语句中 <strong>不能</strong> 包含空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">declare</span><span class="token punctuation">(</span>ticks<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h2 id="类和属性和方法">类和属性和方法</h2>
<blockquote>
<p>任何注释和语句 <strong>一定不可</strong> 跟在其右花括号后的同一行。</p>
<p>当实例化一个类时，后面的圆括号 <strong>必须</strong> 写出来，即使没有参数传进其构造函数。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</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>
</code></pre>
<h3 id="继承和实现">继承和实现</h3>
<blockquote>
<p>关键字 <code>extends</code> 和 <code>implements</code> <strong>必须</strong> 写在类名称的同一行。</p>
<p>类的左花括号 <strong>必须</strong> 另起一行，右花括号 <strong>必须</strong> 跟在类主体的下一行。</p>
<p>类的左花括号 <strong>必须</strong> 独自成行，且 <strong>一定不可</strong> 在其上一行或下一行存在空行。</p>
<p>类的右花括号 <strong>必须</strong> 独自成行，且 <strong>一定不可</strong> 在其上一行存在空行。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">FooClass</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">BarClass</span> <span class="token keyword">as</span> Bar<span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">OtherVendor<span class="token punctuation">\</span>OtherPackage<span class="token punctuation">\</span>BazClass</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span> <span class="token keyword">extends</span> <span class="token class-name">ParentClassName</span> <span class="token keyword">implements</span> <span class="token class-name"><span class="token punctuation">\</span>ArrayAccess</span><span class="token punctuation">,</span> \<span class="token package">Countable</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p><code>implements</code> 的列表 <strong>可以</strong> 分成多行，如果分成多行的话，第一个接口 <strong>必须</strong> 写在下一行，并且每行 <strong>必须</strong> 只写一个接口。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">FooClass</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">BarClass</span> <span class="token keyword">as</span> Bar<span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">OtherVendor<span class="token punctuation">\</span>OtherPackage<span class="token punctuation">\</span>BazClass</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span> <span class="token keyword">extends</span> <span class="token class-name">ParentClassName</span> <span class="token keyword">implements</span>
<span class="token class-name"><span class="token punctuation">\</span>ArrayAccess</span><span class="token punctuation">,</span>
\<span class="token package">Countable</span><span class="token punctuation">,</span>
\<span class="token package">Serializable</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="使用-trait">使用 Trait</h3>
<blockquote>
<p>在类里面使用 Trait <strong>必须</strong> 在左花括号的下一行声明。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>FirstTrait</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token keyword">use</span> <span class="token package">FirstTrait</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>每个导入到类中的 Trait <strong>必须</strong> 包含一个声明，且每个包含声明 <strong>必须</strong> 有其导入语句。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>FirstTrait</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>SecondTrait</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>ThirdTrait</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token keyword">use</span> <span class="token package">FirstTrait</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">SecondTrait</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">ThirdTrait</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>在类文件中，如果在使用 Trait 之后没有其他内容了，类名右大括号 <strong>必须</strong> 另起一行。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>FirstTrait</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token keyword">use</span> <span class="token package">FirstTrait</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>如有其他内容，两者之间 <strong>必须</strong> 空一行。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">use</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package<span class="token punctuation">\</span>FirstTrait</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token keyword">use</span> <span class="token package">FirstTrait</span><span class="token punctuation">;</span>
<span class="token comment">/**
* Just a test property.
*
* @var string
*/</span>
<span class="token keyword">private</span> string <span class="token variable">$propertyName</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'foo'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>当使用 <code>insteadof</code> 和 <code>as</code> 运算符时，它们 <strong>必须</strong> 如下所示使用，注意缩进、间距和另起一行。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">Talker</span>
<span class="token punctuation">{</span>
<span class="token keyword">use</span> <span class="token package">A</span><span class="token punctuation">,</span> <span class="token constant">B</span><span class="token punctuation">,</span> <span class="token constant">C</span> <span class="token punctuation">{</span>
<span class="token constant">B</span><span class="token punctuation">:</span><span class="token punctuation">:</span>smallTalk <span class="token keyword">insteadof</span> <span class="token constant">A</span><span class="token punctuation">;</span>
<span class="token constant">A</span><span class="token punctuation">:</span><span class="token punctuation">:</span>bigTalk <span class="token keyword">insteadof</span> <span class="token constant">C</span><span class="token punctuation">;</span>
<span class="token constant">C</span><span class="token punctuation">:</span><span class="token punctuation">:</span>mediumTalk <span class="token keyword">as</span> FooBar<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="属性和常量">属性和常量</h3>
<blockquote>
<p>每个属性都 <strong>必须</strong> 添加访问修饰符。</p>
<p>如果你的 PHP 版本支持常量可见性，那么所有常量 <strong>必须</strong> 声明可见性。</p>
<p><strong>一定不可</strong> 使用关键字 <code>var</code> 声明一个属性。</p>
<p>每条语句 <strong>一定不可</strong> 定义超过一个属性。</p>
<p><strong>一定不可</strong> 使用下划线作为前缀，来区分属性是 <code>protected</code> 或 <code>private</code> 。</p>
<p>类型声明和属性名之间 <strong>必须</strong> 有一个空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test property.
*
* @var integer
*/</span>
<span class="token keyword">public</span> int <span class="token variable">$propertyName</span> <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
<span class="token comment">/**
* Just a test property.
*
* @var string
*/</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> string <span class="token variable">$anotherPropertyName</span> <span class="token operator">=</span> <span class="token single-quoted-string string">'bar'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="方法和函数">方法和函数</h3>
<blockquote>
<p>所有方法都 <strong>必须</strong> 添加访问修饰符。</p>
<p><strong>一定不可</strong> 使用下划线作为前缀，来区分方法是 <code>protected</code> 或 <code>private</code> 。</p>
<p>方法名称后 <strong>一定不可</strong> 有空格符，其开始花括号 <strong>必须</strong> 独占一行，结束花括号也 <strong>必须</strong> 在方法主体后单独成一行。参数左括号后和右括号前 <strong>一定不可</strong> 有空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</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">methodName</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>
</code></pre>
<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">functionName</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>
</code></pre>
<h3 id="方法和函数参数">方法和函数参数</h3>
<blockquote>
<p>参数列表中，每个逗号后面 <strong>必须</strong> 要有一个空格，而逗号前面 <strong>一定不可</strong> 有空格。</p>
<p>有默认值的参数， <strong>必须</strong> 放到参数列表的末尾。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param int $arg1
* @param string $arg2
* @param array $arg3
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span>int <span class="token variable">$arg1</span><span class="token punctuation">,</span> string <span class="token variable">$arg2</span><span class="token punctuation">,</span> <span class="token keyword">array</span> <span class="token variable">$arg3</span> <span class="token operator">=</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">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>参数列表 <strong>可以</strong> 分成多行，这样，包括第一个参数在内的每个参数都 <strong>必须</strong> 单独成行。</p>
<p>拆分成多行的参数列表后，结束括号以及方法开始花括号 <strong>必须</strong> 写在同一行，中间用一个空格分隔。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param int $arg1
* @param string $arg2
* @param array $arg3
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span>
int <span class="token variable">$arg1</span><span class="token punctuation">,</span>
string <span class="token variable">$arg2</span><span class="token punctuation">,</span>
<span class="token keyword">array</span> <span class="token variable">$arg3</span> <span class="token operator">=</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">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>当你定义一个返回值类型声明时，冒号后面的类型声明 <strong>必须</strong> 用空格符隔开。</p>
<p>冒号和声明 <strong>必须</strong> 在同一行，且跟参数列表后的结束括号之间没有空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param int $arg1
* @param string $arg2
* @return string
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span>int <span class="token variable">$arg1</span><span class="token punctuation">,</span> string <span class="token variable">$arg2</span><span class="token punctuation">)</span><span class="token punctuation">:</span> string
<span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token single-quoted-string string">'foo'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token comment">/**
* Just a test method.
*
* @param int $arg1
* @param string $arg2
* @param array $arg3
* @return string
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">anotherMethodName</span><span class="token punctuation">(</span>
int <span class="token variable">$arg1</span><span class="token punctuation">,</span>
string <span class="token variable">$arg2</span><span class="token punctuation">,</span>
<span class="token keyword">array</span> <span class="token variable">$arg3</span> <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span>
<span class="token punctuation">)</span><span class="token punctuation">:</span> string <span class="token punctuation">{</span>
<span class="token keyword">return</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>
</code></pre>
<blockquote>
<p>在可空类型声明中，问号和类型声明之间 <strong>不能</strong> 有空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param int|null $arg1
* @param string|null $arg2
* @return string|null
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span><span class="token operator">?</span>int <span class="token variable">$arg1</span><span class="token punctuation">,</span> <span class="token operator">?</span>string <span class="token variable">$arg2</span><span class="token punctuation">)</span><span class="token punctuation">:</span> <span class="token operator">?</span>string
<span class="token punctuation">{</span>
<span class="token keyword">return</span> <span class="token single-quoted-string string">'foo'</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>当在参数前使用引用运算符时，引用运算符之后 <strong>不能</strong> 有空格。</p>
<p>可变参数运算符和参数名称之间 <strong>不能</strong> 有空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param int &$arg1
* @param string &$arg2
* @param int $arg3
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span>int <span class="token operator">&</span><span class="token variable">$arg1</span><span class="token punctuation">,</span> string <span class="token operator">&</span><span class="token variable">$arg2</span><span class="token punctuation">,</span> int <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token variable">$arg3</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>
</code></pre>
<blockquote>
<p>当同时使用引用运算符和可变参数运算符时，它们之间 <strong>不能</strong> 有任何空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test method.
*
* @param int &$arg1
* @param int $arg2
* @return void
*/</span>
<span class="token keyword">public</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span>int <span class="token operator">&</span><span class="token variable">$arg1</span><span class="token punctuation">,</span> int <span class="token operator">&</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token variable">$arg2</span><span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="abstract-和-final-和-static">abstract 和 final 和 static</h3>
<blockquote>
<p>需要添加 <code>abstract</code> 或 <code>final</code> 声明时， <code>abstract</code> <strong>必须</strong> 写在访问修饰符之前，而 <code>static</code> 则 <strong>必须</strong> 写在访问修饰符之后。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">namespace</span> <span class="token package">Vendor<span class="token punctuation">\</span>Package</span><span class="token punctuation">;</span>
<span class="token keyword">abstract</span> <span class="token keyword">class</span> <span class="token class-name">ClassName</span>
<span class="token punctuation">{</span>
<span class="token comment">/**
* Just a test property.
*
* @var string|null
*/</span>
<span class="token keyword">protected</span> <span class="token keyword">static</span> <span class="token operator">?</span>string <span class="token variable">$propertyName</span><span class="token punctuation">;</span>
<span class="token comment">/**
* Just an abstract method.
*
* @param void
* @return void
*/</span>
<span class="token keyword">abstract</span> <span class="token keyword">protected</span> <span class="token keyword">function</span> <span class="token function">methodName</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">/**
* Just a test method.
*
* @param void
* @return void
*/</span>
<span class="token keyword">final</span> <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">function</span> <span class="token function">anotherMethodName</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>
</code></pre>
<h3 id="方法和函数的调用">方法和函数的调用</h3>
<blockquote>
<p>方法及函数调用时，方法名或函数名与参数左括号之间 <strong>一定不可</strong> 有空格，参数右括号前也 <strong>一定不可</strong> 有空格。每个参数前 <strong>一定不可</strong> 有空格，但其后 <strong>必须</strong> 有一个空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</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 variable">$foo</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">bar</span><span class="token punctuation">(</span><span class="token variable">$arg1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
Foo<span class="token punctuation">:</span><span class="token punctuation">:</span><span class="token function">bar</span><span class="token punctuation">(</span><span class="token variable">$arg2</span><span class="token punctuation">,</span> <span class="token variable">$arg3</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>参数 <strong>可以</strong> 分列成多行，此时包括第一个参数在内的每个参数都 <strong>必须</strong> 单独成行。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$foo</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">bar</span><span class="token punctuation">(</span>
<span class="token variable">$longArgument</span><span class="token punctuation">,</span>
<span class="token variable">$longerArgument</span><span class="token punctuation">,</span>
<span class="token variable">$muchLongerArgument</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h2 id="流程控制">流程控制</h2>
<blockquote>
<p>流程控制关键字之后 <strong>必须</strong> 要有一个空格。</p>
<p>左括号后面 <strong>不能</strong> 有空格，右括号前面 <strong>不能</strong> 有空格。</p>
<p>右括号与左大括号之间 <strong>必须</strong> 要有一个空格。</p>
<p>流程主体 <strong>必须</strong> 要缩进一次。</p>
<p>流程主体 <strong>必须</strong> 在左大括号之后另起一行。</p>
<p>右大括号 <strong>必须</strong> 在流程主体之后另起一行。</p>
<p>每个流程控制主体 <strong>必须</strong> 以封闭的括号结束，这将标准化流程结构，同时减少由于流程中添加新的内容而引入错误的可能性。</p>
</blockquote>
<h3 id="if-和-elseif-和-else">if 和 elseif 和 else</h3>
<blockquote>
<p>关键字 <code>elseif</code> <strong>应该</strong> 替换 <code>else if</code> ，这样流程控制关键字看起来像一个词。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$expr1</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">elseif</span> <span class="token punctuation">(</span><span class="token variable">$expr2</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>括号中的表达式 <strong>可能</strong> 会被分开为多行，每一行至少缩进一次。如果这样做，第一个条件 <strong>必须</strong> 在新的一行。右括号和左大括号 <strong>必须</strong> 在同一行，而且中间有一个空格。条件中间的逻辑运算符 <strong>必须</strong> 在每一行的开头或者结尾，而不是混在一起。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span>
<span class="token variable">$expr1</span>
<span class="token operator">&&</span> <span class="token variable">$expr2</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">elseif</span> <span class="token punctuation">(</span>
<span class="token variable">$expr3</span>
<span class="token operator">&&</span> <span class="token variable">$expr4</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="switch-和-case">switch 和 case</h3>
<blockquote>
<p><code>case</code> 语句 <strong>必须</strong> 相对 <code>switch</code> 进行一次缩进，而 <code>break</code> 语句以及 <code>case</code> 内的其它语句都 <strong>必须</strong> 相对 <code>case</code> 进行一次缩进。</p>
<p>如果存在非空的 <code>case</code> 语句，主体里 <strong>必须</strong> 有类似 <code>// no break</code> 的注释。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> <span class="token number">0</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">1</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token comment">// no break</span>
<span class="token keyword">case</span> <span class="token number">2</span><span class="token punctuation">:</span>
<span class="token keyword">case</span> <span class="token number">3</span><span class="token punctuation">:</span>
<span class="token keyword">case</span> <span class="token number">4</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token number">4</span><span class="token punctuation">;</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token single-quoted-string string">'default'</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>括号中的表达式 <strong>可能</strong> 会被分开多行，每一行至少要缩进一次。如果这样做，第一个条件 <strong>必须</strong> 在新的一行。右括号和左大括号 <strong>必须</strong> 在同一行，而且中间有一个空格。条件中间的逻辑运算符 <strong>必须</strong> 在每一行的开头或者结尾，而不是混在一起。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">switch</span> <span class="token punctuation">(</span>
<span class="token variable">$expr1</span>
<span class="token operator">&&</span> <span class="token variable">$expr2</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> <span class="token number">0</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token keyword">case</span> <span class="token number">1</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token comment">// no break</span>
<span class="token keyword">case</span> <span class="token number">2</span><span class="token punctuation">:</span>
<span class="token keyword">case</span> <span class="token number">3</span><span class="token punctuation">:</span>
<span class="token keyword">case</span> <span class="token number">4</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token number">4</span><span class="token punctuation">;</span>
<span class="token keyword">return</span><span class="token punctuation">;</span>
<span class="token keyword">default</span><span class="token punctuation">:</span>
<span class="token keyword">echo</span> <span class="token single-quoted-string string">'default'</span><span class="token punctuation">;</span>
<span class="token keyword">break</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="while-和-do-while">while 和 do-while</h3>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token keyword">do</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token variable">$expr</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>括号中的表达式 <strong>可能</strong> 会被分开多行，每一行至少要缩进一次。如果这样做，第一个条件 <strong>必须</strong> 在新的一行。右括号和左大括号 <strong>必须</strong> 在同一行，而且中间有一个空格。条件中间的逻辑运算符 <strong>必须</strong> 在每一行的开头或者结尾，而不是混在一起。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>
<span class="token variable">$expr1</span>
<span class="token operator">&&</span> <span class="token variable">$expr2</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
<span class="token keyword">do</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">while</span> <span class="token punctuation">(</span>
<span class="token variable">$expr1</span>
<span class="token operator">&&</span> <span class="token variable">$expr2</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h3 id="for">for</h3>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token variable">$i</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> <span class="token variable">$i</span> <span class="token operator"><</span> <span class="token number">10</span><span class="token punctuation">;</span> <span class="token variable">$i</span><span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<blockquote>
<p>括号中的表达式 <strong>可能</strong> 会被分开多行，每一行至少要缩进一次。如果这样做，第一个条件 <strong>必须</strong> 在新的一行。右括号和左大括号 <strong>必须</strong> 在同一行，而且中间有一个空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span>
<span class="token variable">$i</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
<span class="token variable">$i</span> <span class="token operator"><</span> <span class="token number">10</span><span class="token punctuation">;</span>
<span class="token variable">$i</span><span class="token operator">++</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="foreach">foreach</h3>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">foreach</span> <span class="token punctuation">(</span><span class="token variable">$iterable</span> <span class="token keyword">as</span> <span class="token variable">$key</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token variable">$value</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="try-和-catch-和-finally">try 和 catch 和 finally</h3>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>FirstExceptionType <span class="token variable">$e</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>OtherExceptionType <span class="token variable">$e</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span>
</code></pre>
<h2 id="运算符">运算符</h2>
<blockquote>
<p>当运算符周围允许出现空格时， <strong>可以</strong> 出于可读性目的使用多个空格。</p>
</blockquote>
<h3 id="一元运算符">一元运算符</h3>
<blockquote>
<p>递增运算符和递减运算符与操作数之间 <strong>不得</strong> 有任何空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$i</span><span class="token operator">++</span><span class="token punctuation">;</span>
<span class="token operator">++</span><span class="token variable">$j</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>类型转换运算符的圆括号内部 <strong>不得</strong> 有任何空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$intValue</span> <span class="token operator">=</span> <span class="token punctuation">(</span>int<span class="token punctuation">)</span> <span class="token variable">$input</span><span class="token punctuation">;</span>
</code></pre>
<h3 id="二元运算符">二元运算符</h3>
<blockquote>
<p>所有二元运算符 <strong>必须</strong> 在前后跟至少一个空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token variable">$a</span> <span class="token operator">===</span> <span class="token variable">$b</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token variable">$bar</span> <span class="token operator">?</span><span class="token operator">?</span> <span class="token variable">$a</span> <span class="token operator">?</span><span class="token operator">?</span> <span class="token variable">$b</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">elseif</span> <span class="token punctuation">(</span><span class="token variable">$a</span> <span class="token operator">></span> <span class="token variable">$b</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token variable">$foo</span> <span class="token operator">=</span> <span class="token variable">$a</span> <span class="token operator">+</span> <span class="token variable">$b</span> <span class="token operator">*</span> <span class="token variable">$c</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h3 id="三元运算符">三元运算符</h3>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$variable</span> <span class="token operator">=</span> <span class="token variable">$foo</span> <span class="token operator">?</span> <span class="token single-quoted-string string">'foo'</span> <span class="token punctuation">:</span> <span class="token single-quoted-string string">'bar'</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>如果省略条件运算符的中间操作数，运算符 <strong>必须</strong> 遵循与其他二元运算符相同的样式规则。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$variable</span> <span class="token operator">=</span> <span class="token variable">$foo</span> <span class="token operator">?</span><span class="token punctuation">:</span> <span class="token single-quoted-string string">'bar'</span><span class="token punctuation">;</span>
</code></pre>
<h2 id="闭包">闭包</h2>
<blockquote>
<p>闭包声明时，关键字 <code>function</code> 后以及关键字 <code>use</code> 的前后都 <strong>必须</strong> 要有一个空格。</p>
<p>开始花括号 <strong>必须</strong> 写在声明的同一行，结束花括号 <strong>必须</strong> 紧跟主体结束的下一行。</p>
<p>参数列表和变量列表的左括号后以及右括号前， <strong>一定不可</strong> 有空格。</p>
<p>参数和变量列表中，逗号前 <strong>一定不可</strong> 有空格，而逗号后 <strong>必须</strong> 要有空格。</p>
<p>闭包中有默认值的参数 <strong>必须</strong> 放到列表的后面。</p>
<p>如果声明了返回类型，它 <strong>必须</strong> 遵循普通函数和方法相同的规则，如果使用 <code>use</code> 关键字，冒号 <strong>必须</strong> 在 <code>use</code> 右括号后且冒号前后不能有空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token comment">/**
* Just a test function.
*
* @param int $arg1
* @param string $arg2
* @return void
*/</span>
<span class="token variable">$closureWithArgs</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>int <span class="token variable">$arg1</span><span class="token punctuation">,</span> string <span class="token variable">$arg2</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 comment">/**
* Just a test function.
*
* @param int $arg1
* @param string $arg2
* @return void
*/</span>
<span class="token variable">$closureWithArgsAndVars</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>int <span class="token variable">$arg1</span><span class="token punctuation">,</span> string <span class="token variable">$arg2</span><span class="token punctuation">)</span> <span class="token keyword">use</span> <span class="token punctuation">(</span><span class="token variable">$var1</span><span class="token punctuation">,</span> <span class="token variable">$var2</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 comment">/**
* Just a test function.
*
* @param int $arg1
* @param string $arg2
* @return string
*/</span>
<span class="token variable">$closureWithArgsVarsAndReturn</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>int <span class="token variable">$arg1</span><span class="token punctuation">,</span> string <span class="token variable">$arg2</span><span class="token punctuation">)</span> <span class="token keyword">use</span> <span class="token punctuation">(</span><span class="token variable">$var1</span><span class="token punctuation">,</span> <span class="token variable">$var2</span><span class="token punctuation">)</span><span class="token punctuation">:</span> string <span class="token punctuation">{</span>
<span class="token keyword">return</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>
</code></pre>
<blockquote>
<p>参数和变量 <strong>可以</strong> 分多行放置，此时第一项 <strong>必须</strong> 放在下一行，并且每行只能有一个参数或变量。</p>
<p>结束多行列表的时候，右括号和左大括号 <strong>必须</strong> 要放在一行，而且中间有一个空格。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token comment">/**
* Just a test function.
*
* @param int $longArgument
* @param string $longerArgument
* @param array $muchLongerArgument
* @return void
*/</span>
<span class="token variable">$longArgs_noVars</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>
int <span class="token variable">$longArgument</span><span class="token punctuation">,</span>
string <span class="token variable">$longerArgument</span><span class="token punctuation">,</span>
<span class="token keyword">array</span> <span class="token variable">$muchLongerArgument</span>
<span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token comment">/**
* Just a test function.
*
* @param void
* @return void
*/</span>
<span class="token variable">$noArgs_longVars</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 keyword">use</span> <span class="token punctuation">(</span>
<span class="token variable">$longVar1</span><span class="token punctuation">,</span>
<span class="token variable">$longerVar2</span><span class="token punctuation">,</span>
<span class="token variable">$muchLongerVar3</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 comment">/**
* Just a test function.
*
* @param int $longArgument
* @param string $longerArgument
* @param array $muchLongerArgument
* @return void
*/</span>
<span class="token variable">$longArgs_longVars</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>
int <span class="token variable">$longArgument</span><span class="token punctuation">,</span>
string <span class="token variable">$longerArgument</span><span class="token punctuation">,</span>
<span class="token keyword">array</span> <span class="token variable">$muchLongerArgument</span>
<span class="token punctuation">)</span> <span class="token keyword">use</span> <span class="token punctuation">(</span>
<span class="token variable">$longVar1</span><span class="token punctuation">,</span>
<span class="token variable">$longerVar2</span><span class="token punctuation">,</span>
<span class="token variable">$muchLongerVar3</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 comment">/**
* Just a test function.
*
* @param int $longArgument
* @param string $longerArgument
* @param array $muchLongerArgument
* @return void
*/</span>
<span class="token variable">$longArgs_shortVars</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>
int <span class="token variable">$longArgument</span><span class="token punctuation">,</span>
string <span class="token variable">$longerArgument</span><span class="token punctuation">,</span>
<span class="token keyword">array</span> <span class="token variable">$muchLongerArgument</span>
<span class="token punctuation">)</span> <span class="token keyword">use</span> <span class="token punctuation">(</span><span class="token variable">$var</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 comment">/**
* Just a test function.
*
* @param int $arg
* @return void
*/</span>
<span class="token variable">$shortArgs_longVars</span> <span class="token operator">=</span> <span class="token keyword">function</span> <span class="token punctuation">(</span>int <span class="token variable">$arg</span><span class="token punctuation">)</span> <span class="token keyword">use</span> <span class="token punctuation">(</span>
<span class="token variable">$longVar1</span><span class="token punctuation">,</span>
<span class="token variable">$longerVar2</span><span class="token punctuation">,</span>
<span class="token variable">$muchLongerVar3</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>
</code></pre>
<blockquote>
<p>注意，闭包被直接用作函数或方法调用的参数时，以上规则仍然适用。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$foo</span><span class="token operator">-</span><span class="token operator">></span><span class="token function">bar</span><span class="token punctuation">(</span>
<span class="token variable">$arg1</span><span class="token punctuation">,</span>
<span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token variable">$arg2</span><span class="token punctuation">)</span> <span class="token keyword">use</span> <span class="token punctuation">(</span><span class="token variable">$var</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 variable">$arg3</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<h2 id="匿名类">匿名类</h2>
<blockquote>
<p>匿名类 <strong>必须</strong> 遵循和闭包一样的规范。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$instance</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">class</span> <span class="token punctuation">{</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre>
<blockquote>
<p>如果接口列表不换行，左花括号 <strong>可以</strong> 在同一行，如果接口列表换行，左花括号 <strong>必须</strong> 放在最后一个接口的下一行。</p>
</blockquote>
<pre class="language-"><code class="lang-php"><span class="token delimiter important"><?php</span>
<span class="token variable">$instance</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">class</span> <span class="token keyword">extends</span> <span class="token class-name"><span class="token punctuation">\</span>Foo</span> <span class="token keyword">implements</span> <span class="token class-name"><span class="token punctuation">\</span>HandleableInterface</span> <span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token variable">$instance</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">class</span> <span class="token keyword">extends</span> <span class="token class-name"><span class="token punctuation">\</span>Foo</span> <span class="token keyword">implements</span>
<span class="token class-name"><span class="token punctuation">\</span>ArrayAccess</span><span class="token punctuation">,</span>
\<span class="token package">Countable</span><span class="token punctuation">,</span>
\<span class="token package">Serializable</span>
<span class="token punctuation">{</span>
<span class="token comment">//</span>
<span class="token punctuation">}</span><span class="token punctuation">;</span>
</code></pre>
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