PHP编码规范/PSR-2
2016-01-26 13:26
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PSR-2 代码风格规范
本篇规范是 PSR-1 基本代码规范的继承与扩展。本规范希望通过制定一系列规范化PHP代码的规则，以减少在浏览不同作者的代码时，因代码风格的不同而造成不便。
当多名程序员在多个项目中合作时，就需要一个共同的编码规范， 而本文中的风格规范源自于多个不同项目代码风格的共同特性， 因此，本规范的价值在于我们都遵循这个编码风格，而不是在于它本身。
关键词 “必须”(“MUST”)、“一定不可/一定不能”(“MUST NOT”)、“需要”(“REQUIRED”)、 “将会”(“SHALL”)、“不会”(“SHALL NOT”)、“应该”(“SHOULD”)、“不该”(“SHOULD NOT”)、 “推荐”(“RECOMMENDED”)、“可以”(“MAY”)和”可选“(“OPTIONAL”)的详细描述可参见 RFC 2119 。
1. 概览
代码 必须 遵循 PSR-1 中的编码规范 。代码 必须 使用4个空格符而不是 tab键 进行缩进。
每行的字符数 应该 软性保持在80个之内， 理论上 一定不可 多于120个， 但 一定不能 有硬性限制。
每个
namespace命名空间声明语句和
use声明语句块后面，必须 插入一个空白行。
类的开始花括号
({) 必须 写在函数声明后自成一行，结束花括号(})也 必须 写在函数主体后自成一行。
方法的开始花括号
({) 必须 写在函数声明后自成一行，结束花括号(})也 必须 写在函数主体后自成一行。
类的属性和方法 必须 添加访问修饰符（
private、
protected以及
public），
abstract以及
final必须 声明在访问修饰符之前，而
static必须 声明在访问修饰符之后。
控制结构的关键字后 必须 要有一个空格符，而调用方法或函数时则 一定不能 有。
控制结构的开始花括号
({) 必须 写在声明的同一行，而结束花括号(})必须 写在主体后自成一行。
控制结构的开始左括号后和结束右括号前，都 一定不能 有空格符。
1.1 例子
以下例子程序简单地展示了以上大部分规范：<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">FooInterface</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">BarClass</span> <span class="hljs-title" style="box-sizing: border-box;">as</span> <span class="hljs-title" style="box-sizing: border-box;">Bar</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">OtherVendor</span>\<span class="hljs-title" style="box-sizing: border-box;">OtherPackage</span>\<span class="hljs-title" style="box-sizing: border-box;">BazClass</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Foo</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Bar</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">implements</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">FooInterface</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">sampleFunction</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$a</span>, <span class="hljs-variable" style="box-sizing: border-box;">$b</span> = null)</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$a</span> === <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$b</span>) {
bar();
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elseif</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$a</span> > <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$b</span>) {
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span>->bar(<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg1</span>);
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {
BazClass::bar(<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg2</span>, <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg3</span>);
}
}
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">bar</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>
{</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// method body</span>
}
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li></ul>
2. 通则
2.1 基本编码准则
代码 必须 符合 PSR-1 中的所有规范
2.2 文件
所有PHP文件 必须 使用Unix LF (linefeed)作为行的结束符。
所有PHP文件 必须 以一个空白行作为结束。
纯PHP代码文件 必须 省略最后的
?>结束标签。
2.3. 行
行的长度 一定不能 有硬性的约束。软性的长度约束 一定 要限制在120个字符以内，若超过此长度，带代码规范检查的编辑器 一定 要发出警告，不过一定不可 发出错误提示。
每行 不应该 多于80个字符，大于80字符的行 应该 折成多行。
非空行后 一定不能 有多余的空格符。
空行 可以 使得阅读代码更加方便以及有助于代码的分块。
每行 一定不能 存在多于一条语句。
2.4. 缩进
代码 必须 使用4个空格符的缩进，一定不能 用 tab键 。备注: 使用空格而不是tab键缩进的好处在于， 避免在比较代码差异、打补丁、重阅代码以及注释时产生混淆。 并且，使用空格缩进，让对齐变得更方便。
2.5. 关键字 以及 True/False/Null
PHP所有 关键字 必须 全部小写。常量
true、
false和
null也 必须 全部小写。
3. namespace 以及 use 声明
namespace声明后 必须 插入一个空白行。
所有
use必须 在
namespace后声明。
每条
use声明语句 必须 只有一个
use关键词。
use声明语句块后 必须 要有一个空白行。
例如：
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0 205fb px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">FooClass</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">BarClass</span> <span class="hljs-title" style="box-sizing: border-box;">as</span> <span class="hljs-title" style="box-sizing: border-box;">Bar</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">OtherVendor</span>\<span class="hljs-title" style="box-sizing: border-box;">OtherPackage</span>\<span class="hljs-title" style="box-sizing: border-box;">BazClass</span>; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// ... additional PHP code ...</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>
4. 类、属性和方法
此处的“类”泛指所有的class类、接口以及traits可复用代码块。
4.1. 扩展与继承
关键词 extends和
implements必须 写在类名称的同一行。
类的开始花括号 必须 独占一行，结束花括号也 必须 在类主体后独占一行。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">FooClass</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">BarClass</span> <span class="hljs-title" style="box-sizing: border-box;">as</span> <span class="hljs-title" style="box-sizing: border-box;">Bar</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">OtherVendor</span>\<span class="hljs-title" style="box-sizing: border-box;">OtherPackage</span>\<span class="hljs-title" style="box-sizing: border-box;">BazClass</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ParentClass</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">implements</span> \<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ArrayAccess</span>, \<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Countable</span>
{</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// constants, properties, methods</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>implements的继承列表也可以分成多行，这样的话，每个继承接口名称都 必须 分开独立成行，包括第一个。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">FooClass</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">BarClass</span> <span class="hljs-title" style="box-sizing: border-box;">as</span> <span class="hljs-title" style="box-sizing: border-box;">Bar</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">use</span> <span class="hljs-title" style="box-sizing: border-box;">OtherVendor</span>\<span class="hljs-title" style="box-sizing: border-box;">OtherPackage</span>\<span class="hljs-title" style="box-sizing: border-box;">BazClass</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ParentClass</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">implements</span>
\<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ArrayAccess</span>,
\<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Countable</span>,
\<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Serializable</span>
{</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// constants, properties, methods</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>
4.2. 属性
每个属性都必须添加访问修饰符。一定不可使用关键字 var 声明一个属性。
每条语句一定不可定义超过一个属性。
不要使用下划线作为前缀，来区分属性是 protected 或 private。
以下是属性声明的一个范例：
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span> = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>;
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>
4.3. 方法
所有方法都 必须 添加访问修饰符。不要使用下划线作为前缀，来区分方法是
protected或
private。
方法名称后 一定不能 有空格符，其开始花括号 必须 独占一行，结束花括号也 必须 在方法主体后单独成一行。参数左括号后和右括号前 一定不能 有空格。
一个标准的方法声明可参照以下范例，留意其括号、逗号、空格以及花括号的位置。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">fooBarBaz</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$arg1</span>, &<span class="hljs-variable" style="box-sizing: border-box;">$arg2</span>, <span class="hljs-variable" style="box-sizing: border-box;">$arg3</span> = [])</span>
{</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// method body</span>
}
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>
4.4. 方法的参数
参数列表中，每个参数后面 必须 要有一个空格，而前面 一定不能 有空格。有默认值的参数，必须 放到参数列表的末尾。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">foo</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$arg1</span>, &<span class="hljs-variable" style="box-sizing: border-box;">$arg2</span>, <span class="hljs-variable" style="box-sizing: border-box;">$arg3</span> = [])</span>
{</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// method body</span>
}
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li></ul>参数列表可以分列成多行，这样，包括第一个参数在内的每个参数都 必须 单独成行。
拆分成多行的参数列表后，结束括号以及方法开始花括号 必须 写在同一行，中间用一个空格分隔。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">aVeryLongMethodName</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
ClassTypeHint <span class="hljs-variable" style="box-sizing: border-box;">$arg1</span>,
&<span class="hljs-variable" style="box-sizing: border-box;">$arg2</span>,
array <span class="hljs-variable" style="box-sizing: border-box;">$arg3</span> = []
)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// method body</span>
}
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li></ul>
4.5. abstract
、 final
、
以及 static
需要添加 abstract或
final声明时，
必须写在访问修饰符前，而
static则必须写在其后。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">namespace</span> <span class="hljs-title" style="box-sizing: border-box;">Vendor</span>\<span class="hljs-title" style="box-sizing: border-box;">Package</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">abstract</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ClassName</span>
{</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">abstract</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">protected</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">zim</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>;</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-title" style="box-sizing: border-box;">bar</span><span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span>
{</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// method body</span>
}
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li></ul>
4.6. 方法及函数调用
方法及函数调用时，方法名或函数名与参数左括号之间 一定不能 有空格，参数右括号前也 一定不能有空格。每个参数前 一定不能 有空格，但其后 必须 有一个空格。<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span> bar(); <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span>->bar(<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg1</span>); Foo::bar(<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg2</span>, <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg3</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
参数可以分列成多行，此时包括第一个参数在内的每个参数都 必须 单独成行。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span> <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span>->bar( <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$longArgument</span>, <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$longerArgument</span>, <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$muchLongerArgument</span> );</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>
5. 控制结构
控制结构的基本规范如下：控制结构关键词后 必须 有一个空格。
左括号 ( 后 一定不能 有空格。
右括号 ) 前也 一定不能 有空格。
右括号 ) 与开始花括号 { 间 一定 有一个空格。
结构体主体 一定 要有一次缩进。
结束花括号 } 一定 在结构体主体后单独成行。
每个结构体的主体都 必须 被包含在成对的花括号之中， 这能让结构体更加结构话，以及减少加入新行时，出错的可能性。
5.1. if
、 elseif
和 else
标准的 if结构如下代码所示，留意 括号、空格以及花括号的位置， 注意
else和
elseif都与前面的结束花括号在同一行。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$expr1</span>) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// if body</span>
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">elseif</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$expr2</span>) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// elseif body</span>
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// else body;</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>应该使用关键词
elseif代替所有
else if，以使得所有的控制关键字都像是单独的一个词。
5.2. switch
和 case
标准的 switch结构如下代码所示，留意括号、空格以及花括号的位置。
case语句必须相对
switch进行一次缩进，而
break语句以及
case内的其它语句都
必须 相对
case进行一次缩进。 如果存在非空的
case直穿语句，主体里必须有类似
// no break 的注释。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$expr</span>) {
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">echo</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'First case, with a break'</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">echo</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Second case, which falls through'</span>;
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// no break</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">echo</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Third case, return instead of break'</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">default</span>:
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">echo</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Default case'</span>;
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>;
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li></ul>
5.3. while
和 do
while
一个规范的 while语句 应该 如下所示，注意其 括号、空格以及花括号的位置。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$expr</span>) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// structure body</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>标准的
do while语句如下所示，同样的，注意其 括号、空格以及花括号的位置。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">do</span> {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// structure body;</span>
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">while</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$expr</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
5.4. for
标准的 for 语句如下所示，注意其 括号、空格以及花括号的位置。<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$i</span> = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$i</span> < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>; <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$i</span>++) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// for body</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
5.5. foreach
标准的 foreach语句如下所示，注意其 括号、空格以及花括号的位置。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">foreach</span> (<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$iterable</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">as</span> <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$key</span> => <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$value</span>) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// foreach body</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
5.6. try
, catch
标准的 try catch语句如下所示，注意其 括号、空格以及花括号的位置。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// try body</span>
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (FirstExceptionType <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$e</span>) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// catch body</span>
} <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (OtherExceptionType <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$e</span>) {
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// catch body</span>
}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>
6. 闭包
闭包声明时，关键词 function后以及关键词
use的前后都 必须 要有一个空格。
开始花括号 必须 写在声明的同一行，结束花括号 必须 紧跟主体结束的下一行。
参数列表和变量列表的左括号后以及右括号前，必须 不能有空格。
参数和变量列表中，逗号前 必须 不能有空格，而逗号后 必须 要有空格。
闭包中有默认值的参数 必须 放到列表的后面。
标准的闭包声明语句如下所示，注意其 括号、逗号、空格以及花括号的位置。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$closureWithArgs</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$arg1</span>, <span class="hljs-variable" style="box-sizing: border-box;">$arg2</span>)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$closureWithArgsAndVars</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$arg1</span>, <span class="hljs-variable" style="box-sizing: border-box;">$arg2</span>)</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$var1</span>, <span class="hljs-variable" style="box-sizing: border-box;">$var2</span>)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>参数列表以及变量列表可以分成多行，这样，包括第一个在内的每个参数或变量都 必须 单独成行，而列表的右括号与闭包的开始花括号 必须 放在同一行。
以下几个例子，包含了参数和变量列表被分成多行的多情况。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$longArgs_noVars</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
<span class="hljs-variable" style="box-sizing: border-box;">$longArgument</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$longerArgument</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$muchLongerArgument</span>
)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$noArgs_longVars</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">()</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
<span class="hljs-variable" style="box-sizing: border-box;">$longVar1</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$longerVar2</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$muchLongerVar3</span>
)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$longArgs_longVars</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
<span class="hljs-variable" style="box-sizing: border-box;">$longArgument</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$longerArgument</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$muchLongerArgument</span>
)</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
<span class="hljs-variable" style="box-sizing: border-box;">$longVar1</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$longerVar2</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$muchLongerVar3</span>
)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$longArgs_shortVars</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
<span class="hljs-variable" style="box-sizing: border-box;">$longArgument</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$longerArgument</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$muchLongerArgument</span>
)</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$var1</span>)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$shortArgs_longVars</span> = <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$arg</span>)</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(
<span class="hljs-variable" style="box-sizing: border-box;">$longVar1</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$longerVar2</span>,
<span class="hljs-variable" style="box-sizing: border-box;">$muchLongerVar3</span>
)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
};</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li></ul>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。
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span>->bar(
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg1</span>,
<span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$arg2</span>)</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$var1</span>)</span> {</span>
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// body</span>
},
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$arg3</span>
);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>
7. 总结
以上规范难免有疏忽，其中包括但不仅限于：全局变量和常量的定义
函数的定义
操作符和赋值
行内对齐
注释和文档描述块
类名的前缀及后缀
最佳实践
本规范之后的修订与扩展将弥补以上不足。
PSR-2 补充文档
1. 摘要
本规范希望通过制定一系列规范化PHP代码的规则，以减少在浏览不同作者的代码时，因代码风格的不同而造成不便。当多名程序员在多个项目中合作时，就需要一个共同的编码规范， 而本文中的风格规范源自于多个不同项目代码风格的共同特性， 因此，本规范的价值在于我们都遵循这个编码风格，而不是在于它本身。
2. 投票
投票点: ML
3. 勘误
3.1 - 多行参数 (09/08/2013)
使用一个或多个跨行的参数（如数组和匿名函数）并不需要触发 4.6 节中关于参数列表的单行规定， 因此，在参数表中的数组和匿名函数是可以单独分列成多行的。以下的例子是符合 PSR-2 规范的：
<code class="language-php hljs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;"><?php</span>
somefunction(<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$foo</span>, <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$bar</span>, [
<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// ...</span>
], <span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$baz</span>);
<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$app</span>->get(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'/hello/{name}'</span>, <span class="hljs-function" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">function</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$name</span>)</span> <span class="hljs-title" style="box-sizing: border-box;">use</span> <span class="hljs-params" style="color: rgb(102, 0, 102); box-sizing: border-box;">(<span class="hljs-variable" style="box-sizing: border-box;">$app</span>)</span> {</span>
<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">'Hello '</span>.<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$app</span>->escape(<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">$name</span>);
});</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>
3.2 - 多行参数 (10/17/2013)
当需要扩展多个接口时，extends的相关规范与 4.1 节中
implements的规范一致。
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