diff --git a/php/cl_contactform_output.php b/php/cl_contactform_output.php
index 20ad6ea..2a1ee92 100644
--- a/php/cl_contactform_output.php
+++ b/php/cl_contactform_output.php
@@ -16,7 +16,8 @@ require_once $sFrontEndPath . 'securimage.php';
 require_once $sFrontEndPath . 'CaptchaObject.php';
 require_once $sFrontEndPath . 'StorageAdapter/AdapterInterface.php';
 
-class w3form {
+class w3form
+{
 
     private array $email = ['adresses' => '', 'from' => ['name' => '', 'email' => ''], 'message' => '', 'subject' => ''];
     private array $unraveled = [];
@@ -58,8 +59,9 @@ class w3form {
         }
     }
 
-    private function add2Message($key, $value) {
-        if (strlen($key) > 25 OR strlen($value) > 54) {
+    private function add2Message($key, $value): void
+    {
+        if (strlen($key) > 25 or strlen($value) > 54) {
             $this->email['message'] .= "$key\n$value\n";
         } else {
             $this->email['message'] .= $key;
@@ -68,14 +70,16 @@ class w3form {
         }
     }
 
-    private function generateEmailMessage() {
+    private function generateEmailMessage(): void
+    {
         if ($this->unraveled)
             foreach ($this->unraveled as $key => $value) {
                 $this->add2Message($key, $value);
             }
     }
 
-    private function suppress() {
+    private function suppress(): array
+    {
         $fields = [];
         $suppress = func_get_args();
         foreach ($_POST as $key => $value) {
@@ -85,7 +89,8 @@ class w3form {
         return $fields;
     }
 
-    public function addEmailAdress($email) {
+    public function addEmailAdress($email): void
+    {
         if (empty($this->emailAdresses)) {
             $this->email['adresses'] .= "$email";
         } else {
@@ -93,34 +98,40 @@ class w3form {
         }
     }
 
-    public function setEmailSubject($subject) {
+    public function setEmailSubject($subject): void
+    {
         $this->email['subject'] = $subject;
     }
 
-    public function setEmailFrom($email, $name) {
+    public function setEmailFrom($email, $name): void
+    {
         $this->email['from']['email'] = $email;
         $this->email['from']['name'] = $name;
     }
 
-    public function setForm($form) {
+    public function setForm($form): void
+    {
         $this->form['form'] = $form;
     }
 
-    public function setAnswer($answer) {
+    public function setAnswer($answer): void
+    {
         $this->form['answer'] = $answer;
     }
 
-    public function setBackgroundError($color) {
+    public function setBackgroundError($color): void
+    {
         $this->form['colorError'] = $color;
     }
 
-    public function formInterpretation(&$form) {
+    public function formInterpretation(&$form): array
+    {
         $fields = explode('###', $form);
         $field = [];
 
         for ($i = 1; $i < count($fields); $i = $i + 2) {
-            $attributte = explode(';', trim($fields[$i]));
-            foreach ($attributte as $attribute) {
+            $attribute = explode(';', trim($fields[$i]));
+            foreach ($attribute as $attribute) {
                 $nameValue = explode(':', trim($attribute));
                 if ($nameValue[0] != 'option' && $nameValue[0] != 'optionvalue') {
                     $field["{$fields[$i]}"]["{$nameValue[0]}"] = $nameValue[1];
@@ -133,7 +144,8 @@ class w3form {
         return $field;
     }
 
-    public function formOutput($sent = false) {
+    public function formOutput($sent = false): void
+    {
         echo '<div class="textItem secondItem"><form action="" method="POST" class="form-horizontal">';
         echo '<input type="hidden" name="sent" value="true" />';
         $form = $this->form['form'];
@@ -151,7 +163,8 @@ class w3form {
         echo '</form></div>';
     }
 
-    public function formField($attribute, $sent) {
+    public function formField($attribute, $sent): void
+    {
         $style = '';
         $value = '';
         $parameter = "name=\"{$attribute['name']}\"";
@@ -186,10 +199,10 @@ class w3form {
                     $capId = @$_POST['captcha_id'];
                     $securimage = new Securimage();
 
-                    if ($securimage->check($captcha) == false) {
+                    if (!$securimage->check($captcha)) {
                         echo '<style>'
-                        . '#captcha_code {background-color: '.$this->form['colorError'].'}'
-                                . '</style>';
+                            . '#captcha_code {background-color: ' . $this->form['colorError'] . '}'
+                            . '</style>';
                     }
                 }
                 // show captcha HTML using Securimage::getCaptchaHtml()
@@ -281,7 +294,8 @@ class w3form {
         }
     }
 
-    private function formComplete() {
+    private function formComplete(): bool
+    {
         $form = $this->form['form'];
         $fields = $this->formInterpretation($form);
         foreach ($fields as $field) {
@@ -292,7 +306,8 @@ class w3form {
         return true;
     }
 
-    private function success() {
+    private function success(): void
+    {
         if ($this->sendEmail()) {
             echo $this->form['answer'];
         } else {
@@ -300,7 +315,8 @@ class w3form {
         }
     }
 
-    private function formFieldCorrect(&$field) {
+    private function formFieldCorrect(&$field): bool
+    {
 
         $tmp_name = rtrim($field['name'], '[0]');
         preg_match('/\[(\d*)\]/', $field['name'], $matches);
@@ -387,7 +403,8 @@ class w3form {
         return true;
     }
 
-    public function process() {
+    public function process(): void
+    {
         if (!isset($_POST['sent'])) {
             $this->formOutput();
         } elseif ($this->formComplete()) {
@@ -395,7 +412,7 @@ class w3form {
             $captcha = @$_POST['ct_captcha'];
             $capId = @$_POST['captcha_id'];
             $securimage = new Securimage();
-            if ($securimage->check($captcha, $capId, true) == false) {
+            if (!$securimage->check($captcha, $capId, true)) {
                 echo '<div style="color: red;">' . mi18n("Ihr Captcha Code war nicht korrekt. Bitte versuchen Sie es erneut.") . '</div>';
                 $this->formOutput(true);
             } else {