feat: Type hinting all the way.

assets/php/contact_form.php

@@ -6,17 +6,16 @@ function sanitize_text(string $name, string $type) {
         'text' => FILTER_SANITIZE_SPECIAL_CHARS,
         'email' => FILTER_SANITIZE_EMAIL,
     );
-    $text = trim($text);
-    $text = filter_var($_POST[$name], $filters[$type]);
+    $text = filter_var(trim($_POST[$name]), $filters[$type]);
     $text = stripslashes($text);
 
     return $text;
 }
 
-function prepare_message_body($message) {
+function prepare_message_body(string $message, string $name) {
     // Replace HTML-Entities with actual carriage returns and line feeds
     $message = str_replace("
", "\r", $message);
-    $message = str_replace("
", "\r", $message);
+    $message = str_replace("
", "\n", $message);
 
     // Ensure line breaks via carriage return + line feed
     $message = str_replace("\r\n", "\n", $message);
@@ -34,11 +33,11 @@ function prepare_message_body($message) {
  *  mail(): Braucht auf dem Server einen korrekt konfigurierten Mailserver
  *  phpmailer: Bibliothek, der per Composer installiert wird. Tut ganz gut mit SMTP.
  */
-function send_message_to_office($subject, $message, $name, $email) {
+function send_message_to_office(string $subject, string $message, string $name, string $email) {
     return mail(
         getenv('WTF_CONTACT_TO'),
         "=?UTF-8?B?" . base64_encode($subject) . "?=",
-        prepare_message_body($message),
+        prepare_message_body($message, $name),
         $additional_headers = array(
             "From" => getenv('WTF_CONTACT_FROM'),
             "Reply-To" => $email,
@@ -49,7 +48,7 @@ function send_message_to_office($subject, $message, $name, $email) {
     );
 }
 
-function send_response($response_data) {
+function send_response(array $response_data) {
     $json = json_encode($response_data);
     if ($json === false) {
         // Avoid echo of empty string (which is invalid JSON), and