3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { private $bar = '120'; protected $var = '240'; public function __sleep() { return ['bar']; } } $obj = new Foo(); echo serialize($obj);
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
O:3:"Foo":1:{s:8:"Foobar";s:3:"120";}

preferences:
176.07 ms | 404 KiB | 226 Q