multiple __autoload

gistfile1.php

function __autoload($class_name) {
    $exp = explode("_", $class_name);
    if(($exp_length = count($exp)) > 1){
        $file = ABSPATH . '/bases/lib/';
        foreach($exp as $key=>$val){
            if(($exp_length-1) == $key){
                $file .= $val.'.class.php';
            }else{
                $file .= $val.'/';
            }
        }
    }else{
        $file = ABSPATH . '/bases/classes/' . $class_name . '.class.php';
    }

    if (!file_exists($file)) {

        require_once ABSPATH . '/sistema/conteudo/erros/404.phtml';
        return;
    }

    // Inclui o arquivo da classe
    require_once $file;
}