Default implementation for __autoload() spl_autoload_unregister spl_classes SPL Functions PHP Manual spl_autoload (PHP 5 >= 5.1.2)spl_autoload — Default implementation for __autoload() Description void spl_autoload ( string $class_name [, string $file_extensions ] ) This function is intended to be used as a default implementation for __autoload(). If nothing else is specified and autoload_register() is called without any parameters then this functions will be used for any later call to __autoload(). Parameters class_name file_extensions By default it checks all include paths to contain filenames built up by the lowercase class name appended by the filename extensions .inc and .php. Return Values No value is returned. spl_autoload_unregister spl_classes SPL Functions PHP Manual