How do i send an email with attachment in PHP?

Hello,

I have a form that gets people name, emial, etc. Right now its working correctly, what it does is it sends a email to a seperate email account of the info entered. But what i want to do now is have the person submitting their info to receive an automatic email with an attachment sent to the email they provided. I could really use your help.

Thank you.

Here is the PHP script:

  <?php
if(isset($_POST['email'])) {

$email_to = "sspromo@lvpaiute.com";
$email_subject = "Registration Form";


function died($error) {
  echo "We are very sorry, but there were error(s) found with the form your submitted. ";
  echo "These errors appear below.<br /><br />";
  echo $error."<br /><br />";
  echo "Please go back and fix these errors.<br /><br />";
  die();
}

if(!isset($_POST['first_name']) ||
  !isset($_POST['last_name']) ||
  !isset($_POST['email']) ||
  !isset($_POST['address']) ||
  !isset($_POST['city']) ||
  !isset($_POST['state']) ||
  !isset($_POST['zipcode']) ||
  !isset($_POST['comments'])) {
  died('We are sorry, but there appears to be a problem with the form your submitted.'); 
}

$first_name = $_POST['first_name']; // required
$last_name = $_POST['last_name']; // required
$email_from = $_POST['email']; // required
$address = $_POST['address']; // required
$city = $_POST['city']; // required
$state = $_POST['state']; // required
$zipcode = $_POST['zipcode']; // required
$comments = $_POST['comments']; // required

$error_message = "";
$email_exp = "^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$";
  if(!eregi($email_exp,$email_from)) {
   $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
  }
$string_exp = "^[a-z .'-]+$";
  if(!eregi($string_exp,$first_name)) {
   $error_message .= 'The First Name you entered does not appear to be valid.<br />';
  }
  if(!eregi($string_exp,$last_name)) {
   $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
  }
  if(strlen($error_message) > 0) {
   died($error_message);
  }
$email_message = "Form details below.\n\n";

function clean_string($string) {
   $bad = array("content-type","bcc:","to:","cc:","href");
   return str_replace($bad,"",$string);
}

$email_message .= "First Name: ".clean_string($first_name)."\n";
$email_message .= "Last Name: ".clean_string($last_name)."\n";
$email_message .= "Email: ".clean_string($email_from)."\n";
$email_message .= "Address: ".clean_string($address)."\n";
$email_message .= "City: ".clean_string($city)."\n";
$email_message .= "State: ".clean_string($state)."\n";
$email_message .= "Zip Code: ".clean_string($zipcode)."\n";
$email_message .= "Comments: ".clean_string($comments)."\n";


// create email headers
$headers = 'From: '.$first_name."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@644699($email_to, $email_subject, $email_message, $headers); 
?>