3v4l.org

run code in 300+ PHP versions simultaneously
<?php $rows = 4; $starting_number = 1; for($i = 1;$i <= $rows;++$i){ $number = $starting_number; for($j = 1;$j <= 4;++$j){ echo $number," "; $number += 4; } echo PHP_EOL; $starting_number++; }
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16
preferences:
134.06 ms | 407 KiB | 5 Q