<?php
function phpChallenge($int1,$int2){
$bool = true;
while($bool){
if($int1 == $int2) return $int2;
($int1 > $int2 ? $int1 -=$int2 : $int2 -= $int1);
}
}
echo phpChallenge(15,30);
?>
PD9waHAKICBmdW5jdGlvbiBwaHBDaGFsbGVuZ2UoJGludDEsJGludDIpewogICRib29sID0gdHJ1ZTsKICAgICB3aGlsZSgkYm9vbCl7CiAgICAgIGlmKCRpbnQxID09ICRpbnQyKSByZXR1cm4gJGludDI7CiAgICAgICAgICAoJGludDEgPiAkaW50MiA/ICRpbnQxIC09JGludDIgOiAkaW50MiAtPSAkaW50MSk7CiAgICAgIH0KfQoKIGVjaG8gcGhwQ2hhbGxlbmdlKDE1LDMwKTsKPz4K