<?php

class DynamicObject {

    /**
     * @var DynamicObject
     */
    public $prototype;

    public function __construct(array $attributes = array()) {
        foreach ($attributes as $name => $value) {
            $this->$name = $value;
        }
    }

    public function __get($varName) {
        if (!isset($this->$varName)) {
            return $this->prototype->$varName;
        }
    }

    public function __call($methodName, $params) {
        array_unshift($params, $this);
        if (isset($this->$methodName)) {
            return call_user_func_array($this->$methodName, $params);
        } else {
            return call_user_func_array($this->prototype->$methodName, $params);
        }
    }

    public static function extend(DynamicObject $prototype, $attributes = array()) {
        $child = new self($attributes);
        $child->prototype = $prototype;
        return $child;
    }

}

$animal = new DynamicObject(array(
            'age' => 0,
            'name' => 'El Barto',
            'breathe' => function($me) {
                echo $me->name . " is breathing<br/>";
            }
        ));


$animal->breathe(); // Echo: El Barto is breathing

///////////////////////////////////////////////////////////////////////////////
// Prototypal inheritance: an object extend another object
//

$cat = DynamicObject::extend($animal, array(
            'breathe' => function($me) {
                echo $me->name . " is purring<br/>";
            }
        ));

$cat->breathe(); // Echo: El Barto is purring


// Modifyng the prototype dynamically change the child too

$animal->eat = function($me){
    echo 'Gnam!<br/>';
};

$cat->eat(); // Echo: Gnam