3v4l.org

run code in 300+ PHP versions simultaneously
<?php $z=5; for($i = 1; $i <= 100; $i += $z){ echo $i . ', '; if($i>40) $z=10; }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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
1, 6, 11, 16, 21, 26, 31, 36, 41, 51, 61, 71, 81, 91,
preferences:
259.05 ms | 406 KiB | 403 Q