PHP function overloading

It may be hackish to some, but I learned this way from how Cakephp does some functions and have adapted it because I like the flexibility it creates

The idea is you have different type of arguments, arrays, objects etc, then you detect what you were passed and go from there

function($arg1, $lastname) {
    if(is_array($arg1)){
        $lastname = $arg1['lastname'];
        $firstname = $arg1['firstname'];
    } else {
        $firstname = $arg1;
    }
    ...
}