JackTheKnife

Once again, because looks like ppl are confused what I am asking about. I have piece of code: //$host = $_SERVER['HTTP_HOST']; //disabeld for testing $host = "www.my-domain.com"; //dummy domain for testing $sql = "SELECT * FROM Items WHERE LandingPageURL = '".$host."'"; ....... $landingpage = $row["LandingPage"]; ........... if ($landingpage==$host){ $_SESSION["pid"] = $product['id']; $_SESSION["price"] = $product['price']; ........... } else { echo "oops... wrong page"; } Then I do POST form to the another site (domain) on this same server but all $_SESSION vars are empty when I have use $host = $_SERVER['HTTP_HOST'] instead of $host = "www.my-domain.com";

What is different between: $host = $_SERVER['HTTP_HOST']; and $host = "www.my-domain.com"; Somehow when I have to use first line then $_SESSION vars doesn't go through two different domains.