Dynamically add methods to objects with Closure:::bind

Dynamic method addition.php

Trait Addable {

    private $methods = array();

    public function addMethod( $name, $callable ) {
        $this->methods[$name] = Closure::bind( $callable, $this, get_class() );
    }

    public function __call( $method, array $args ) {
        call_user_func_array( $this->methods[$method], $args );
    }

}

Class Dog {
    use Addable;
    const LEGS = 4;
    private $noise = 'Bark!';
}


$dog = new Dog;
$dog->addMethod(
    'speak',
    function(){
        echo $this->noise . ' I have ' . self::LEGS . ' legs.';
    }
);
$dog->speak();