Recently I wrote a post on how autoloading works, and the current standard implemented by the PHP community the PSR-0 standard autoloader which is used by Symfony2 , Lithium , Zend , Aura etc . You can read more on the post Autoloading in PHP and the PSR-0 Standard . If you are using PHP 5.4 , Aura Autoload also provides a PSR-0 Standard SPL autoloader implementation for PHP. It also matches the proposed SplClassLoader interface. Thank you once again for sitepoint and the whole team giving me an opporchunity to make this post available to you.