작동하지 않는 상점에 대한 PHP 양식 유효성 검사

그래서 고객이 이름, 주소, 이메일 등을 입력 할 수있는 온라인 상점의 PHP 양식을 만들려고했지만 유효성 검사가 제대로 작동하지 않는 것 같습니다. 입력 된 데이터가 잘못된 것처럼 항상 동일한 페이지 (insert.php 파일로 이동하는 대신)에 유지됩니다.

<?php
$nameErr = $emailErr = $codeErr = $cityErr = $streetErr = $fakturaErr = "";
$name_ok = $email_ok = $code_ok = $city_ok = $street_ok = 0;
$name = $email = $code = $city = $street = $info = "";

if ($_SERVER["REQUEST_METHOD"] == "POST") {

    if (empty($_POST["name"])) {
        $nameErr = "Pole wymagane";
    } 
    else{
        $name = test_input($_POST["name"]);
     // check if name only contains letters and whitespace
        if (!preg_match("/^[a-zA-Z ]*$/",$name)) {
            $nameErr = "Dozwolone tylko litery"; 
        }
        else{
            $name_ok=1;
        }
    }

    if (empty($_POST["code"])) {
        $codeErr = "Pole wymagane";
    } 
    else {
        $code = test_input($_POST["code"]);
     // check if name only contains letters and whitespace
        if (!preg_match("/^[0-9 ]*$/",$code)) {
            $codeErr = "Niewłaściwy format kodu"; 
        }
        else{
            $code_ok=1;
        }
    }

    if (empty($_POST["city"])) {
        $cityErr = "Pole wymagane";
    } 
    else{
        $city = test_input($_POST["city"]);
     // check if city only contains letters and whitespace
        if (!preg_match("/^[a-zA-Z ]*$/",$city)) {
            $cityErr = "Dozwolone tylko litery"; 
        }
        else{
            $city_ok=1;
        }
    }

    if (empty($_POST["street"])) {
        $streetErr = "Pole wymagane";
    } 
    else {
        $street = test_input($_POST["street"]);
     // check if name only contains letters and whitespace
        if (!preg_match("/^[a-zA-Z ]*$/",$street)) {
            $streetErr = "Dozwolone tylko litery"; 
        }
        else{
            $street_ok=1;
        }
    }



    if (empty($_POST["email"])) {
        $emailErr = "Email is required";
    } 
    else {
        $email = test_input($_POST["email"]);
     // check if e-mail address is well-formed
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            $emailErr = "Niewłaściwy format adresu e-mail"; 
        }
        else{
            $email_ok=1;
        }
    }

    $action = ""; 
    if($name_ok==1 && $code_ok==1 && $city_ok==1 && $street_ok==1 && $email_ok==1) {
        $action = "insert.php";
    } 
    else {
        $action = "#";
    }

   /*if (empty($_POST["comment"])) {
     $comment = "";
   } else {
     $comment = test_input($_POST["comment"]);
   }

   if (empty($_POST["gender"])) {
     $genderErr = "Gender is required";
   } else {
     $gender = test_input($_POST["gender"]);
   }
  */
}

function test_input($data) {
   $data = trim($data);
   $data = stripslashes($data);
   $data = htmlspecialchars($data);
   return $data;
}

?>


<div class="all">
    <form action="<?php echo $action; ?>" method="post">
        <font color="#A20B0B">*Pola wymagane</font><br><br>

        Imię i nazwisko: <input type="text" name="name">
        <span class="error"><font color="#A20B0B">* <?php echo $nameErr;?></font></span>
        <br><br>

        Kod pocztowy:
        <input type="text" name="code">
        <span class="error"><font color="#A20B0B">* <?php echo $codeErr;?></font></span>
        <br><br>

        Miasto:
        <input type="text" name="city">
        <span class="error"><font color="#A20B0B">* <?php echo $cityErr;?></font></span>
        <br><br>

        Ulica:
        <input type="text" name="street">
        <span class="error"><font color="#A20B0B">* <?php echo $streetErr;?></font></span>
        <br><br>

        E-mail:
        <input type="text" name="email">
        <span class="error"><font color="#A20B0B">* <?php echo $emailErr;?></font></span>
        <br><br>

        <label>Dodatkowe informacje: <textarea name="info" rows="5" cols="40"></textarea>
        <br><br>

        Faktura:
        <input type="radio" name="faktura" value="tak">Tak
        <input type="radio" name="faktura" value="nie">Nie
        <span class="error"><font color="#A20B0B">* <?php echo $fakturaErr;?></font></span>
        <br><br>

        <input type="submit" name="submit" value="Submit" id="register" disabled> 
    </form>

</div>