3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo{ public function __call($method, $args) { if(is_callable(array($this, $method))) { return call_user_func_array($this->$method, $args); } // else throw exception } } $foo = new Foo; $foo->cb = function($who) { return "Hello $who"; }; echo $foo->cb('World');
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Deprecated: Creation of dynamic property Foo::$cb is deprecated in /in/fTa8R on line 13 Hello World
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Hello World
preferences:
210.45 ms | 404 KiB | 244 Q