Convert CamelCase to under_score_case in php __autoload()

Question

PHP manual suggests to autoload classes like

function __autoload($class_name){
 require_once(\"some_dir/\".$class_name.\".php\");
}

and this a

Answer 1

You could convert the class name like this...

function __autoload($class_name){
    $name = strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', $class_name));
    require_once("some_dir/".$name.".php");
}