3v4l.org

run code in 500+ PHP versions simultaneously
<?php if ("null" == null) { echo "true"; } else { echo "false"; }
Output for 4.3.0, 5.4.45, 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
false
preferences:
59.86 ms | 850 KiB | 4 Q