function shift($char, $key)
{
// Convert upper to lower.
if (ord($char) >= 65 && ord($char) <= 90) {
$temp = strtolower($char);
$char = $temp;
}
$code = letterToNum($char);
$shifted = $code + $key;
// If it isn't a letter.
if (ord($char) >= 97 && ord($char) <= 122) {
if ($key < 0) {
if ($shifted < 0) {
$coded = 26 + $shifted;
$newCh = NumToLetter($coded);
} else {
$coded = $shifted;
$newCh = NumToLetter($coded);
}
return $newCh;
} else {
if ($shifted > 25) {
$coded = $shifted % 26;
$newCh = NumToLetter($coded);
} else {
$coded = $shifted;
$newCh = NumToLetter($coded);
}
}
return $newCh;
} else {
return $char;
}
}
function clean($plaintext)
{
$strippedText = "";
$cleanText = "";
for ($i = 0; $i < strlen($plaintext); $i++) {
if (ord($plaintext[$i]) >= 65 && ord($plaintext[$i]) <= 90) {
$strippedText .= strtolower($plaintext[$i]);
} else {
if (ord($plaintext[$i]) >= 97 && ord($plaintext[$i]) <= 122) {
$strippedText .= $plaintext[$i];
}
}
}
$cleanText .= letterToNum($strippedText[0]);
for ($j = 1; $j < strlen($strippedText); $j++) {
$cleanText .= "," . letterToNum($strippedText[$j]);
}
return $cleanText;
}