gistfile1.php

<?php
trait PrototypeContainerTrait
{
    public function __call($method, array $args)
    {
        if (is_callable($this->$method)) {
            return call_user_func_array($this->$method, $args);
        }
    }
}

class Foo
{
    use PrototypeContainerTrait;
}

$foo = new Foo();
$foo->times = function($x, $y) {
    return $x * $y;
};