3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A { protected $a; } class B extends A { private $a; public function square() { echo $this->a * parent::$a; } }
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28, 5.5.0 - 5.5.12
Fatal error: Access level to B::$a must be protected (as in class A) or weaker in /in/nlFrU on line 12
Process exited with code 255.
preferences:
194.89 ms | 1395 KiB | 78 Q