validation für registration

Controller/UserController.php

@@ -31,11 +31,19 @@ class UserController{
     }
 
     public function showUserRegisterForm(){
+        if (!isset($this->errors)) {
+            $this->errors = [];
+        }
+        if (!isset($this->validData)) {
+            $this->validData = [];
+        }
+
         $this->view->setVars([
             'labels' => $this->labels,
             'errors' => $this->errors,
             'validData' => $this->validData
         ]);
+        
     }
 
     public function showUserRegisterConfirmation(){
@@ -98,9 +106,16 @@ class UserController{
     }
 
     public function register(){
+        $this->validateForm();
+
+        if(count($this->errors) > 0){
+            $this->view->setDoMethodName("showUserRegisterForm");
+            $this->showUserRegisterForm();
+        } else{
             $this->db->createUser($_POST);
             $this->login();
         }
+    }
 
     public function login(){
         $user = $this->db->getUserByEmail($_POST["email"]);