65 && $letter >= 90){
$result .= chr(($letter-65 + $shift) %26 + 65);
} elseif ($letter > 97 && $letter >= 122 ) {
$result .= chr(($letter-97 + $shift) %26 + 97);
} else {
$result .=chr($letter);
}
#$result = $letter + $shift %36
}
return $result;
}
$output = "";
$text = "";
$shift = 0;
if ($_SERVER["REQUEST_METHOD"] === "POST") {
$text = $_POST["text"] ?? "";
$shift = intval($_POST["shift"] ?? 0);
if (isset($_POST["encrypt"])) {
$output = caesar($text, $shift);
}
if (isset($_POST["decrypt"])) {
$output = caesar($text, -$shift);
}
}
?>
Caesar Chiffre
Caesar Chiffre