3v4l.org

run code in 300+ PHP versions simultaneously
<?php $test['aaa'] = null; echo isset($test); echo empty($test);
Output for 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:
51.06 ms | 406 KiB | 5 Q