PSR-0 Automatic loading Standard

From 2014-10-21 onwards, the PSR-0 standard was marked as obsolete. It is recommended to use the PSR-4 standard as replacement.

The loader (autoloader) must comply with the requirements below.

Requirements:

• A complete namespace or class must have the following structure\ \( \)*
• Each namespace must have a top-level space name (' Vendor name ')
• Each namespace can have multiple sub-namespaces
• When loaded from the file system, separators (\) in the namespace are converted to file separators
• Each of the class names _ (underscores) is converted to a file delimiter. _there is no special meaning in the namespaces
• When loading from the file system, the full namespace or class must be .php used as the suffix name

• Developer names, namespaces, and classes can consist of uppercase and lowercase letters (case-sensitive)

  Example

• \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

Underscores in namespaces and classes

• \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

These should be the minimum standards to implement an autoloader. You can use this to load the PHP 5.3 class of autoloader to practice these standards.

Code implementation

    functionautoload($className){$className= LTrim ($className,'\\');//Remove backslash in front of namespace$fileName='';$namespace='';if($lastNsPos= Strrpos ($className,'\\')) {//The position of the backslash before the class name$namespace= substr ($className,0,$lastNsPos);//Namespace$className= substr ($className,$lastNsPos+1);//class name$fileName= Str_replace ('\\', Directory_separator,$namespace). Directory_separator;//File name}$fileName. = Str_replace ('_', Directory_separator,$className).'. php ';//Standard to be suffixed with. PHP, the underscore of the class name needs to be converted to a file delimiterrequire$fileName;} Spl_autoload_register (' AutoLoad ');

Splclassloader implementation

Here is a simple splclassloader implementation that you can use to load classes if you follow the above criteria. We recommend using the PSR-0 standard to load PHP 5.3 classes

• http://gist.github.com/221634 (to turn over the wall??? ）

Original Reading PSR-0

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'). Text (i)); }; $numbering. FadeIn (1700); }); });

The above describes the PSR-0 automatic loading standards, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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