PHP contact form not working right - php

Question

I've been working on a contact form. I have added used the POST method to send it to a set email address. It doesn't seem to be working though. It just runs and stops as if the code is broken. The HTML and PHP are below.
<form action="contact-form.php" method="post" id="contact-form" name="contact-form">
<div class="form-group">
<label for="name">Your name</label> <input class=
"form-control" id="name" name="name" type="text">
</div>
<div class="form-group">
<label for="email">Email address</label>
<input class="form-control" id="email" name="email"
type="email">
</div>
<div class="form-group">
<label for="phone">Phone</label> <input class=
"form-control" id="phone" name="phone" type="text">
</div>
<div class="form-group">
<label for="message">Your message</label>
<textarea class="form-control" id="message" name=
"message" rows="6">
</textarea>
</div>
<div class="submit">
<input class="button button-small" type="submit"
value="Send">
</div>
</form>
<?php
if(isset($_POST['submit'])) {
$to = "gfrazer#hotmail.co.uk";
$from = $_POST['email'];
$name = $_POST['name'];
$phone = $_POST['phone'];
$message = $name . " " . " wrote the following: " . "\n\n" . $_POST['message'];
$headers = "From:" . $from;
$headers2 = "From:" . $to;
mail($to,$subject,$message,$headers);
mail($from,$subject2,$message2,$headers2); // sends a copy of the message to the sender
header('Location: http://www.google.co.uk');
}
?>

Answer 1

You need to add a name to your submit button. From your snippit, you have no $_POST['submit']:
<form action="contact-form.php" method="post" id="contact-form" name="contact-form">
<div class="form-group">
<label for="email">Email address</label>
<input class="form-control" id="email" name="email" type="email">
</div>
<div class="form-group">
<label for="phone">Phone</label> <input class="form-control" id="phone" name="phone" type="text">
</div>
<div class="form-group">
<label for="message">Your message</label>
<textarea class="form-control" id="message" name="message" rows="6"></textarea>
</div>
<div class="submit">
<!-- ADD name="submit" -->
<input name="submit" class="button button-small" type="submit" value="Send" />
</div>
</form>