Online PHP editor | vld for MluojW

<?php class A { private static self $singleton; private function __construct() {} public static function getInstance(): self { if(!isset(self::$singleton)) { self::$singleton = new self; } return self::$singleton; } } $a = A::getInstance(); $b = A::getInstance(); $c = A::getInstance(); var_dump($a); var_dump($b); var_dump($c);