Online PHP editor | refs for 2WrEL

<?php trait Singleton { protected static $instance; final public static function getInstance() { static $instance; if (!isset(static::$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, $a->set(),$b, $b->get());