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 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
false
preferences:
53.01 ms | 888 KiB | 4 Q