.PHP电子邮件表单发送但收到空字段

I have made a .PHP file that when the email form is filled out it sends it to my email address. Now this all works fine, I get the email, but, I get empty fields, here is the email I received from my test:

"Name:

Email:

Messages: "

as you see, all the fields are empty even though they were filled out.

Here is the code for the .php file:

<?php

$first_name = $_POST['name'];
$email_message = $_POST['email'];
$message = $_POST['message'];

$headers = "Website message";
$headers = "From: $_email";
$to = 'enquiries@ajmoger.co.uk';
$subject = 'AJ Moger website comment submission';
$message = "
Name: $first_name 

Email: $email_message 

Messages: $message 
";

mail($to, $subject, $message, $headers);

header("Location: thank_you.html");
die();
?>'

and here is the HTML code for the form:

The reason is enctype="text/plain" on your <form>. Remove that from your <form> code.

There seems like a bug was filed on this topic , but the status is closed. So it's better not to use that encoding type.