Need help about shopping cart, session...

[UnknownPlayer]

Need help with this code, if someone can help me..

   // current session id
   $sid = session_id();

   // check if the product is already
   // in cart table for this session
   $sql = "SELECT pd_id
           FROM tbl_cart
           WHERE pd_id = $productId AND ct_session_id = '$sid'";
   $result = dbQuery($sql);

 

There is a problem with $sid = session_id();, in my code, that function always get me 0 in my php code.. do i need to set this in some other way..

Anyway, there are no registred users, i just need to set session for current user..

 

Like this tutorial:

http://www.phpwebcommerce.com/shop-add-to-cart.php

[BlueSkyIS]

is session_start() somewhere about that code snippet? if not, you'll get no session_id()

[UnknownPlayer]

Thanks

Is it wrong if i put this code in every page in my website ?