3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(0); function f($s){for($i=-($l=strlen($s));$i<$l;$I=abs(++$i)){$t=substr($s,$I);echo str_repeat(' ',$I).strrev($t).substr($t,1)."\n";}} echo "------------\n"; f(" desserts"); echo "------------\n";
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
------------ stressed desserts s sts strts strerts streserts stressserts stressesserts stressedesserts stressed desserts stressedesserts stressesserts stressserts streserts strerts strts sts s ------------

preferences:
45.35 ms | 463 KiB | 5 Q