3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f( $str ){ $l = strlen($str); for( $i = -$l; $i < $l; $i++ ){ $I = abs($i); $s = substr($str,$I); echo str_repeat(',',$I) . strrev($s) . $s . "\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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
------------ ,,,,,,,,, ,,,,,,,,ss ,,,,,,,stts ,,,,,,strrts ,,,,,streerts ,,,,stresserts ,,,stresssserts ,,stresseesserts ,stresseddesserts stressed..desserts ,stresseddesserts ,,stresseesserts ,,,stresssserts ,,,,stresserts ,,,,,streerts ,,,,,,strrts ,,,,,,,stts ,,,,,,,,ss ------------
preferences:
341.08 ms | 406 KiB | 451 Q