PHP's Spl_autoload Standard library approach

The Spl_autoload method in PHP5 is equivalent to implementing its own __autoload

<? PHP     function __autoload ($classname) {        if(is_file($classname . '. php ') {            include$classname. php ';         ElseIf (is_file($classname. Inc ') {            include$classname. Inc ';        }    }

It will automatically look for a. php/.inc file with the same name as $classname in the registration directory. Of course, you can also specify a specific file by registering the extension

<? php    spl_autoload_extensions ('. Php,.inc,.some ');

So how do you load Spl_autoload automatically, by

<? php    spl_autoload_register ();

Spl_autoload_register has a $callback parameter, if not specified, it will automatically register spl_autoload, in order to be able to search for more automatic loading directory, you can set the automatic loading directory before the code

<? PHP     Set_include_path (Get_include_path(). Path_separator. ' Some/path '. Directory_separator);

These methods are commonly used in PHP frameworks.