表单不显示输入数据

我有一个运行表单，它工作了一半。表单正确发送到我的电子邮件地址，但我遇到输入未在电子邮件中显示文本的问题。唯一吐出任何数据的是消息部分。

姓名，电子邮件，电话和网站输入没有吐出任何数据，我不知道为什么？

HTML5 代码

   <form action="forms/get_form.php" method="post">
       <div>
         <label for="name">Name</label>
           <input type="text" id="name" placeholder="enter name" required="required">
       </div>
       <div>
          <label for="email">Email</label>
            <input type="email" id="email" placeholder="email address" required="required">
       </div>
       <div>
          <label for="phone">Phone Number</label>
            <input type="tel" id="phone" placeholder="enter phone number" required="required">
        </div>
        <div>
           <label for="website">Enter website URL if you have one (optional)</label>
             <input type="url" id="website" placeholder="website address">
         </div>
         <div>
           <label for="message">Enter your message</label>
             <textarea name="message" id="message" rows="10"></textarea>
         </div>
         <div>
           <button type="submit" class="btn-blue">Send</button>
         </div>
  </form>

//PHP 代码

<?php
$name = $_POST['name'];
$email = $_POST['email'];
$phone = $_POST['phone'];
$website = $_POST['website'];
$message = $_POST['message'];
$formcontent=" From: $name 'n Email: $email 'n Phone: $phone 'n Website: $website 'n Message: $message";
$recipient = "email goes here";
$subject = "Contact Form";
$mailheader = "From: $email 'r'n";
mail($recipient, $subject, $formcontent, $mailheader);
if(mail) {
header('Location: /thankyou.html'); 
} else {echo "Email failed to send click back and check email details!";}
?>

提前致谢

可视化