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 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
1

preferences:
55.07 ms | 406 KiB | 5 Q