3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [ 'foo' => null ]; var_dump(isset($a['foo'])); $b = new stdClass; $b->foo = null; var_dump(isset($b->foo));
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
bool(false) bool(false)
preferences:
155.75 ms | 404 KiB | 182 Q