3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = ["is_set" => ["a", "b", "c"]]; if($arr["is_set"] == false) echo "x"; else echo "y";
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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
y
preferences:
198.99 ms | 404 KiB | 197 Q