3v4l.org

run code in 300+ PHP versions simultaneously
<?php $deep = function($i,$recur){ echo $i; if($i < 10){ $recur($i+1,$recur); } }; $deep(0,$deep);
Output for 5.3.3 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.12 - 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
012345678910
preferences:
126.37 ms | 405 KiB | 259 Q