3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Animal { public function __call($name, $args) { if (preg_match('/^is(A-Z].+)/', $name, $matches)) { return $matches[1] === get_called_class(); } } } class Cat extends Animal { } class Dog extends Animal { } $dog = new Dog(); print $dog->isDog(); print $dog->isCat();

preferences:
54.71 ms | 402 KiB | 5 Q