PHP need help

I have a contact form php coding that looks like this:
It doesn't seem to be working. Can somone help me with this?

<?php
//print "<pre>";
//print_r ($_POST);exit;

$name1_field=$_POST['firstname'];
$name2_field=$_POST['lastname'];
$zipcode_field=$_POST['zipcode'];
$dayphone_field=$_POST['daytimephone'];
$evenphone_field=$_POST['eveningphone'];
$email_field=$_POST['email'];
$comments_field=$_POST['comments'];

if(isset($_POST['submit'])){
$message = "$name1_field, $name2_field. (zip code: $zipcode_field> $dayphone_field daytime phonenumber, $evenphone_field evening phone number, comments: $comments_field";
$message = htmlentities($message);

$headers ="MIME-Version: 1.0" ."/r/n";
$headers .="Content-Type: text/html; charset=utf-8" ."/r/n";
$headers .="From: $email_field";

mail("myemail@gmail.com", "A New Message From StayAtHomeSolutions.com", $message, $headers);

header('Location:contact.php');
}else{
header('Location:index.php');
}
?>

 

I tried it and it worked. The first two lines of headers probably not needed. Read this, it might give you more info.