3v4l.org

run code in 300+ PHP versions simultaneously
<?php class T{ public $a = 1; public $b = null; } $t = new T; var_dump(isset($t->a)); var_dump(isset($t->b));
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(true) bool(false)

preferences:
159.16 ms | 403 KiB | 169 Q