Issue with a PHP Online Order Form - php

Question

I've created a contact form for a website with multiple fields. The clear button works perfectly, but when I click the Submit button, I inadvertently download the .php file associated with the webpage, instead of sending an email with the order form to the specified address. I'm really new to php here, so any help would be greatly appreciated.
<?php
$field_name = $_POST['cf_name'];
$field_email = $_POST['cf_email'];
$field_quantity = $_POST['cf_quantity'];
$field_which = $_POST['cf_which'];
$field_size = $_POST['cf_size'];
$field_school = $_POST['cf_school'];
$field_college = $_POST['cf_college'];
$field_message = $_POST['cf_message'];
$mail_to = 'xxx#gmail.com';
$subject = 'TShirt Order - xxx.Org '.$field_name;
$body_message = 'From: '.$field_name."\n";
$body_message .= 'E-mail Address: '.$field_email."\n";
$body_message .= 'Quantity of Shirts: '.$field_quantity."\n";
$body_message .= 'Shirt Style(s): '.field_which."\n";
$body_message .= 'Size(s): '.field_size."\n";
$body_message .= 'School: '.field_school."\n";
$body_message .= 'College: '.field_college."\n";
$body_message .= 'Message: '.$field_message;
$headers = 'From: '.$field_email."\r\n";
$headers .= 'Reply-To: '.$field_email."\r\n";
$mail_status = mail($mail_to, $subject, $body_message, $headers);
if ($mail_status) { ?>
<script language="javascript" type="text/javascript">
alert('Thank you for placing an order with xxx.Org. We will contact you shortly.');
window.location = 'contact_page.html';
</script>
<?php
}
else { ?>
<script language="javascript" type="text/javascript">
alert('Message failed. Please, send an email to xxx#gmail.com');
window.location = 'contact_page.html';
</script>
<?php
}
?>
the html code is:
<form action="contact.php" method="post">
Full Name:
<input type="text" name="cf_name">
<br />
<br />
Email Address:
<input type="text" name="cf_email">
<br />
<br />
Quantity of TShirts:
<input type="numeric" name="cf_quantity">
<br />
<br />
Which Style(s)?
<input type="text" name="cf_which">
<br />
<br />
Size(s):
<input type="text" name="cf_size">
<br />
<br />
Name of School:
<input type="text" name="cf_school">
<br />
<br />
Name of College:
<input type="text" name="cf_college">
<br />
<br />
<input type="submit" value="Send">
<input type="reset" value="Clear">
</form>

Answer 1

Are you completely sure the server accepts php? Seams to me the server doesn't understand it should use the php interpeter and instead of activating the php commands it just lets you download the file.
If you're not sure try and make a file with a simple in it, call that and see if it works.
best regards,
Mark