<?php
$str="johnny";
$ret = "";
$n=5;
$n=$n-1;
for($i = 0, $l = strlen($str); $i < $l; ++$i) {
if (97 <= $c && $c < 123) {
$ret.= chr(($c + $n + 7) % 26 + 97); } else if(65 <= $c && $c < 91) {
$ret.= chr(($c + $n + 13) % 26 + 65); } else {
$ret.= $str[$i];
}
}
echo $ret;
?>
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