PSR-0 automatic loading standard
从2014-10-21日起，PSR-0标准被标记为废弃。推荐使用PSR-4标准作为替换。
加载器（autoloader）必须遵循以下所下要求。
要求：
- 一个完整的命名空间或类必须拥有以下结构
\<Vendor Name>\(<Namespace>\)*<Class Name> - 每一个命名空间必须有一个顶级的空间名(‘Vendor Name’)
- 每一个命名空间可以拥有多个子命名空间
- 从文件系统中加载时，命名空间中的分隔符（\）将被转化为文件分隔符
- 类名中的每一个
_(下划线)将被转化为文件分隔符。命名空间中的_没有特殊含义 - 从文件系统中加载时，完整命名空间或类须以
.php作为后缀名 -
开发商名、命名空间和类可以由大小写字母构成（区分大小写）
示例
\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
命名空间和类中的下划线
-
\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
这些应当是实现一个自动加载器的最低标准。你可以通过这个可以加载PHP 5.3类的自动加载器来实践下这些标准。
代码实现
<code><span><?php</span><span><span>function</span><span>autoload</span><span>(<span>$className</span>)</span>
{</span><span>$className</span> = ltrim(<span>$className</span>,<span>'\\'</span>);<span>//去除命名空间前面的反斜杠</span><span>$fileName</span> = <span>''</span>;
<span>$namespace</span> = <span>''</span>;
<span>if</span>(<span>$lastNsPos</span> = strrpos(<span>$className</span>,<span>'\\'</span>)) {<span>//类名前反斜杠的位置</span><span>$namespace</span> = substr(<span>$className</span>,<span>0</span>,<span>$lastNsPos</span>);<span>//命名空间</span><span>$className</span> = substr(<span>$className</span>,<span>$lastNsPos</span> + <span>1</span>);<span>//类名</span><span>$fileName</span> = str_replace(<span>'\\'</span>,DIRECTORY_SEPARATOR,<span>$namespace</span>). DIRECTORY_SEPARATOR;<span>//文件名</span>
}
<span>$fileName</span> .= str_replace(<span>'_'</span>,DIRECTORY_SEPARATOR,<span>$className</span>). <span>'.php'</span>;<span>//标准中的要以.php作为后缀，类名的下划线需要转化为文件分隔符</span><span>require</span><span>$fileName</span>;
}
spl_autoload_register(<span>'autoload'</span>);</code>SplClassLoader 实现
下面是一个简单的SplClassLoader 实现，如果你遵循以上标准，你可以通过它来加载类。推荐使用PSR-0标准来加载 PHP 5.3的类
- http://gist.github.com/221634（要翻墙？？？）
').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });原文 阅读PSR-0
以上就介绍了PSR-0 自动加载标准，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
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