function ControleGeldigheid($aantalErrors){

        //echo "ControleGeldigheid() Started"."<br>";

        $errors = array();

        $userName = $_POST['user'];
        $email = $_POST['email'];
        $password = $_POST['pass'];
        $cpassword = $_POST['cpass'];
        $mainCharacter = $_POST['mainCharacter'];

        //echo "Controle username"."<br>";

        if (!preg_match("/^[0-9a-zA-Z ]*$/",$userName)) {
          $errors[] = "Username: Only letters, numbers  and white space allowed. 6-18 characters";
        }

        //echo "Controle email"."<br>";

        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
          $errors[] = "Invalid email format";
        }

        //echo "Controle passwords"."<br>";

        if ($password == $cpassword) {
            if(!preg_match('/^(?=.*\d)(?=.*[@#\-_$%^&+=§!\?])(?=.*[a-z])(?=.*[A-Z])[0-9A-Za-z@#\-_$%^&+=§!\?]{8,20}$/',$password)) {
                $errors[] = "Invalid password.<br>Must contain: at least one lowercase char, at least one uppercase char, at least one digit, at least one special sign of @#-_$%^&+=§!?";
            }
        }
        else {
            $errors[] = "Passwords do not match";
        }

        //echo "Controle armory link"."<br>";

        if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$mainCharacter)) {
          $errors[] = "Invalid Character Armory link";
        }

        // Tellen van aantal fouten
        $aantalErrors = 0;
        $aantalErrors = $aantalErrors + count($errors);

        if($aantalErrors > 0){

        echo "<div id='foutBox'><p class='foutLijst'>";

            for ($i = 0; $i < count($errors);$i++){

                $errorTeller = $i + 1;

                echo $errors[$i]."<br /><br />";

            }
            echo "</div></p>";
        }

        return $aantalErrors;

    }