3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [0,1,2,3,4,5]; for($row = 1; $row < count($arr); $row++) { echo $row - 1; } echo "\n\n"; for($row = 0; $row < count($arr) - 1; $row++) { echo $row; }
Output for 5.6.38, 7.1.0 - 7.1.22, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
01234 01234
preferences:
102.36 ms | 1434 KiB | 4 Q