3v4l.org

run code in 300+ PHP versions simultaneously
<?php class C { function __get($key) {return ($key === 'x') ? 'x' : '';} function __isset($key) {return TRUE;} } $c = new C; var_export(empty($c->x)); var_export(empty($c->other));
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 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
falsetrue
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5
truetrue
preferences:
280.81 ms | 402 KiB | 358 Q