Why are only selected parameters passed through the form?

Question

PHP

Hello! I have a standard form to order a call with the parameters name, phone, email, message. The whole catch is that the data of the name and phone fields reach, but email and message do not. What could be the reason? The form itself:

<form name="sentMessage" class="form form-register1" id="contactForm" >

      <div class="control-group">
      <div class="controls">
      <input type="text" class="form-control" onblur='if(this.value=="") this.placeholder="Ваше имя"' onfocus='if(this.value=="Ваше имя") this.value=""' placeholder="Ваше имя" id="name" required data-validation-required-message="Пожалуйста укажите ваше имя" />
        <p class="help-block"></p>
      </div>
      </div>  
      <div class="control-group">
      <div class="controls">
      <input type="tel" class="form-control" onblur='if(this.value=="") this.placeholder="Телефон"' onfocus='if(this.value=="Телефон") this.value=""' placeholder="Телефон" id="phone" required data-validation-required-message="Пожалуйста, укажите номер телефона" />
      </div>
      </div>
      <div class="control-group">
      <div class="controls">
      <input type="email" class="form-control" onblur='if(this.value=="") this.placeholder="Email"' onfocus='if(this.value=="Email") this.value=""' placeholder="[email protected]" required name="email" id="email" required data-validation-required-message="Пожалуйста, укажите ваш e-mail">
      </div>
      </div>
      <div class="control-group">
      <div class="controls">
      <textarea class="form-control" onblur='if(this.value=="") this.placeholder="Ваше сообщение"' onfocus='if(this.value=="Ваше сообщение") this.value=""' placeholder="Введите сообщение..." id="message" name="message" required data-validation-required-message="Пожалуйста, введите ваш вопрос" /></textarea>
      </div>
      </div>

      <div id="success"> </div> <!-- For success/fail messages -->
         <button type="submit" class="ring-btn-yellow">Отправить</button>
    </form>

And the form handler:

if(empty($_POST['name'])   ||  empty($_POST['phone']))
   {
echo "Не переданы данные!";
return false;
   }

$name = $_POST['name'];
$phone = $_POST['phone'];
$message = $_POST['message'];
$email = $_POST['email'];

$to = '[email protected]'; // put your email
$email_subject = "Вам отправлена форма - Перезвоните мне: $name";
$email_body = "Заполнена форма \"Перезвоните мне\". \n\n".
 "Данные отправителя:\n\nИмя: $name ".
 "Телефон: $phone \n".
 "Email: $email \n".
 "Сообщение: $message";
$headers = "From: [email protected]\n";
$headers .= "Reply-To:"; 
mail($to,$email_subject,$email_body,$headers);
return true;

moreover, if I add a data check empty($_POST['email']) and empty($_POST['message']) then the form is not processed at all and the data is not sent. Why?

Answer 1

Judging by the form, on the contrary, you should not receive the "phone" field, since name="phone" is not filled in the input id="phone". But this is if you send via post. Which is unlikely, because for sending you need not <button type="submit"> but <input type="submit">
If you send via AJAX (without page transition), you also need to look in the JS script, which fields it is transmits.

Answer 2

Add a name attribute where it doesn't exist