3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = 0; $nxt = 0; $limit = 10; for($i = 0; $i<$limit; $i++){ echo $a = $a?$a:1; $nxt = $nxt+$a; echo ", "; }
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.3.7
1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
preferences:
236.15 ms | 403 KiB | 292 Q