Scrutinizer: set $domain to string

Author: mambax7

htdocs/include/xoopssetcookie.php

@@ -34,8 +34,8 @@ function xoops_setcookie(
     string $name,
     ?string $value = '',
     int $expire = 0,
-     $path = '/',
-     $domain = '',
+    ?string $path = '/',
+    ?string $domain = '',
     ?bool $secure = null,
     bool $httponly = true,
     string $samesite = 'Lax'
@@ -50,6 +50,9 @@ function xoops_setcookie(
     if (!is_string($host)) {
         $host = ''; // Fallback for invalid XOOPS_URL
     }
+    if (!is_string($domain)) {
+        $domain = ''; // Fallback for invalid domain
+    }
 
     // Validate the domain BEFORE using it.
     if (class_exists('\Xoops\RegDom\RegisteredDomain')) {