3v4l.org

run code in 300+ PHP versions simultaneously
<?php $p=$argv[1]; preg_match("/c([ao]+)/i",$p,$e); $l=strlen($e[1]); $s=($k=strcmp($e[0][1],o))?eo:oo; echo $p,' go M',str_repeat($s[0],$l),str_repeat($s[1],$l),$k?w:'';

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44.04 ms | 402 KiB | 5 Q