Online PHP editor | refs for BE8HE

<?php trait Singleton { public static function getInstance(){ static $instance = null; if (!isset(static::$instance)) { static::$instance = new static(); } return static::$instance; } } abstract class Abudabia { use Singleton; } class a1 extends Abudabia { public function set() { return 'allah ahbar'; } } class a2 extends Abudabia { public function get() { return 'algazira'; } } $a = a1::getInstance(); $b = a2::getInstance(); var_dump($a,$b);