3v4l.org

run code in 300+ PHP versions simultaneously
<?php $test['aaa'] = null; echo isset($test['aaa']); echo empty($test['aaa']);
Output for 5.1.3, 5.6.39, 8.1.0 - 8.1.30, 8.2.0 - 8.2.24, 8.3.0 - 8.3.12
1

preferences:
45.7 ms | 406 KiB | 5 Q