• 一个完全标准的命名空间必须要有一下的格式结构\<Vendor Name>\(<Namespace>\)*<Class Name>
  • 命名空间必须有一个顶级的组织名称 (“Vendor Name”).
  • 命名空间中可以根据情况决定使用多少个子空间
  • 命名空间中的分隔符当从文件系统加载的时候将被映射为 DIRECTORY_SEPARATOR
  • 命名空间中的类名中的_没有特殊含义,也将被作为DIRECTORY_SEPARATOR对待.
  • 命名空间中的类名在从文件系统加载时文件名都需要以.php结尾
  • 组织名,空间名,类名都可以随意选择使用大小写英文字符


  • \Doctrine\Common\IsolatedClassLoader => /path/to/project/lib/vendor/Doctrine/Common/IsolatedClassLoader.php
  • \Symfony\Core\Request => /path/to/project/lib/vendor/Symfony/Core/Request.php
  • \Zend\Acl => /path/to/project/lib/vendor/Zend/Acl.php
  • \Zend\Mail\Message => /path/to/project/lib/vendor/Zend/Mail/Message.php


  • \namespace\package\Class_Name => /path/to/project/lib/vendor/namespace/package/Class/Name.php
  • \namespace\package_name\Class_Name => /path/to/project/lib/vendor/namespace/package_name/Class/Name.php

以上是我们为实现无痛的自动加载特性设定的最低标准。你可以按照此标准实现一个SplClassLoader在PHP 5.3中去加载类。




function autoload($className)
    $className = ltrim($className, '\\');
    $fileName  = '';
    $namespace = '';
    if ($lastNsPos = strrpos($className, '\\')) {
        $namespace = substr($className, 0, $lastNsPos);
        $className = substr($className, $lastNsPos + 1);
        $fileName  = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
    $fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . '.php';

    require $fileName;



18 thoughts on “PHP编码规范:自动加载器特性强制性要求

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