Basic rot13 function for PHP (remember that this is NOT secure encryption!).
It’s built into php nowadays, but if you have an old version you may not.
Display clean php code for copying
// Rot 13 function for older php versions
function rot13($text){
$length = strlen($text);
$newtext = '';
for($i = 0; $i < $length; $i++){
$index = ord($text[$i]);
// Rotate upper case.
if($index > 64 && $index < 91){
$index += 13;
if($index > 90) $index -= 26;
$newtext .= chr($index);
// Rotate lower case.
}elseif($index > 96 && $index < 123){
$index += 13;
if($index > 122) $index -= 26;
$newtext .= chr($index);
}else{ $newtext .= $text[$i]; }
}
return $newtext;
}