<?php
function rcmp($a, $b) {
if($a == $b) {
return 0;
}
return ($a < $b) ? -1 : 1;
}
echo rcmp($a, $b)."\n";
echo rcmp($b, $a)."\n";
PD9waHAKCmZ1bmN0aW9uIHJjbXAoJGEsICRiKSB7CiAgICBpZigkYSA9PSAkYikgewogICAgICAgIHJldHVybiAwOwogICAgfQogICAgcmV0dXJuICgkYSA8ICRiKSA/IC0xIDogMTsKfQoKCiRhID0gYXJyYXkoMSA9PiAnZm9vJyk7CiRiID0gYXJyYXkoMiA9PiAnZm9vJyk7CgplY2hvIHJjbXAoJGEsICRiKS4iXG4iOwplY2hvIHJjbXAoJGIsICRhKS4iXG4iOw==