3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = (string)123; $sum = 1; for($i=0; $i< strlen($a); ++$i){ $sum = $sum + $a[$i]; } echo $sum;
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
7

preferences:
158.67 ms | 403 KiB | 183 Q