3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = 10; if($x < ++$x) { echo "Hello World"; } ?>
Output for 5.1.1 - 5.1.6, 5.2.17, 5.3.29, 5.4.45, 7.0.25, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Output for 4.3.0, 4.4.0, 5.0.0 - 5.0.5
Hello World
preferences:
96.94 ms | 407 KiB | 5 Q