diff --git a/MD_STD.php b/MD_STD.php
index 5335ec9..5cd1c2a 100644
--- a/MD_STD.php
+++ b/MD_STD.php
@@ -259,7 +259,7 @@ class MD_STD {
             while (!empty($lang_code)) {
                 // phpcs:enable
                 // mal sehen, ob der Sprachcode angeboten wird
-                if (\in_array(\strtolower(\join('-', $lang_code)), $allowed_languages)) {
+                if (\in_array(\strtolower(\join('-', $lang_code)), $allowed_languages, true)) {
                     // Qualität anschauen
                     if ($lang_quality > $current_q) {
                         // diese Sprache verwenden
diff --git a/MD_STD_IN.php b/MD_STD_IN.php
index e7412b7..2ff0456 100644
--- a/MD_STD_IN.php
+++ b/MD_STD_IN.php
@@ -20,7 +20,7 @@ class MD_STD_IN {
      */
     final public static function sanitize_id($input):int {
 
-        $input = filter_var($input, FILTER_VALIDATE_INT, [
+        $input = \filter_var($input, \FILTER_VALIDATE_INT, [
                 'options' => [
                     'min_range' => 1,           // Minimum number of an ID generated.
                     'max_range' => 4294967295   // Max value for MySQL's int data type
@@ -47,7 +47,7 @@ class MD_STD_IN {
 
         if ($input === "") return 0;
 
-        $input = filter_var($input, FILTER_VALIDATE_INT, [
+        $input = \filter_var($input, \FILTER_VALIDATE_INT, [
                 'options' => [
                     'min_range' => 0,           // Minimum number of an ID generated.
                     'max_range' => 4294967295   // Max value for MySQL's int data type
@@ -103,7 +103,7 @@ class MD_STD_IN {
         }
         else $output = self::sanitize_text($default);
 
-        if (!empty($allowed) and !in_array($output, $allowed)) {
+        if (!empty($allowed) and !\in_array($output, $allowed, true)) {
             Throw new MDpageParameterNotFromListException("Parameter `{$var_name}` must be any of the allowed values: " . implode(', ', $allowed));
         }
 
@@ -128,7 +128,7 @@ class MD_STD_IN {
         }
         else $output = self::sanitize_text($default);
 
-        if (!empty($allowed) and !in_array($output, $allowed)) {
+        if (!empty($allowed) and !\in_array($output, $allowed, true)) {
             Throw new MDpageParameterNotFromListException("Parameter `{$var_name}` must be any of the allowed values: " . implode(', ', $allowed));
         }