3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = []; $b = [1, 2]; var_dump(!$a, !$b); var_dump(empty($a), empty($b));
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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
bool(true) bool(false) bool(true) bool(false)
preferences:
147.64 ms | 404 KiB | 293 Q