3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { private $bar; private $baz; function __construct($foo) { var_dump($foo); $this->bar = $foo; var_dump($this->bar); } public function bar($baz = null) { $this->baz = array ('foo' => $this->bar['foo'][$baz]); } } $class = new foo("arst"); $class->bar(1); ?>

preferences:
74.3 ms | 402 KiB | 5 Q