3v4l.org

run code in 300+ PHP versions simultaneously
<?php $max = 5; for ($i = 1; $i <= $max; $i++) { for ($j = 1; $j <= $max; $j++) if ($i == $j) { echo "$j"; } else { echo "*"; } echo "\n"; } ?>
Output for 5.5.0 - 5.5.38, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
1**** *2*** **3** ***4* ****5

preferences:
177.98 ms | 408 KiB | 5 Q