dynamic-object.php

<?php
/** 
 * PHP also could behave as prototype object
 */
 
class Object {
    public function __call($name, $args)
    {
        return call_user_func_array(
            $this->$name,
            $args
        );
    }
}

$app = new Object();
$app->action = function ($hello) {
    echo "Hello: {$hello}";
};
$app->action('World'); // Hello: World

$app->action = function ($wtf) {
    echo "WTF: {$wtf}";
};
$app->action('World'); // WTF: World