<input type="hidden" name="product" type="text" value="' . $product_name . '"/>

  <input name="quantity" type="text" value="' . $each_item['quantity'] . '"  />

<?php
$product = $_POST['product'];
$quantity = $_POST['quantity'];
$name = $_POST['name'];
$adress = $_POST['adress'];
$city = $_POST['city'];
$phone= $_POST['phone'];
$email = $_POST['email'];

$to  = 'marko@gmail.com';
$subject = 'Order';


$message = "<p> ".$product." ".$quantity." ".$name." ".$adress." ".$city." ".$phone."     `enter code here`".$email." </p>";

$headers  = 'MIME-Version: 1.0' . "rn";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "rn";
$headers .= 'From: Linux rulez' . "rn";
$mail=mail($to, $subject, $message, $headers);
if($mail){
    echo"Success!";
}
?>