store data in session??

joyce posted this at 01:00 — 8th August 2002.

Joined: Nov 2001

hi, i have a shopping cart where user need not login when they add product into the cart. a same product can be only added to the cart once. how to check in order to make sure they only can add once??

this is my code..

<?php
if (isset($HTTP_POST_VARS['pid']['pid'])) 
    {
        $_SESSION['pid'][] = $HTTP_POST_VARS['pid']['pid'];
    }

    foreach($_SESSION['pid'] as $pid) 
    {
        echo \"pid:$pid<br>\";
        $select_pro = mysql_query(\"select * from sc_product where pid='$pid'\");
        $num = mysql_num_rows($select_pro);
        
        if ($num > 0) 
        {
            while ($temp = mysql_fetch_array($select_pro)) 
            {
                $pid = $temp['pid'];
                $sku = $temp['sku'];
                $pro_name = $temp['pro_name'];
                $pro_cat = $temp['pro_cat'];
                $pro_brand = $temp['pro_brand'];
                $our_price = $temp['our_price'];
                $retail_price = $temp['retail_price'];
                $pro_weight = $temp['pro_weight'];
                            
                echo \"<tr><td width=5% align=center><input type=text name=qty value=\\"$qty\\" size=2 class=ft1></td>\";
                echo \"<td width=35% align=center>$pro_name</td>\";
                echo \"<td width=15% align=center>$our_price</td>\";            
                echo \"<td width=15% align=center>$amount</td></tr>\";
            }
        }
}
?>

and another thing is, i try to echo the pid below the foreach:

<?php
echo \"pid:$pid<br>\";
?>

and as a result, i got this when i add the first product in my cart:

pid:
pid:2

and when i add the second product,

pid:
pid:2
pid:
pid:4

why there is an extra pid everytime i add a product? anything wrong with tat??

Mark Hensler posted this at 06:23 — 8th August 2002.

He has: 4,048 posts

Joined: Aug 2000

try this:
print_r($HTTP_POST_VARS);
print_r($_SESSION);

Hopefully, something (a patern) will stand out and you'll know where the problem is.

joyce posted this at 04:28 — 9th August 2002.

They have: 164 posts

Joined: Nov 2001

i got this as a result

Array ( [go] => Add To Shopping Cart [form] => Array ( [sku] => xxx ) [pid] => Array ( [pid] => 3 ) ) Array ( [pid] => Array ( [0] => ) ) 

wat does this mean??

Mark Hensler posted this at 07:05 — 9th August 2002.

He has: 4,048 posts

Joined: Aug 2000

It's much easier to read if you view source... then it's all spaced out:

Array
(
    [go] => Add To Shopping Cart
    [form] => Array
        (
            [sku] => xxx
        )
    [pid] => Array
        (
            [pid] => 3
        )
)
Array
(
    [pid] => Array
        (
            [0] =>
        )
)

'From that, it looks like your vars are:

$HTTP_POST_VARS[go] = "Add To Shopping Cart";
$HTTP_POST_VARS[form][sku] = "xxx";
$HTTP_POST_VARS[pid][pid] = 3;

$_SESSION[pid][0] = NULL;

'It looks like the problem is here:
$_SESSION['pid'][] = $HTTP_POST_VARS['pid']['pid'];

But I don't see anything wrong with that syntatically.
I've never seen or tried to assign anything to $_SESION directly,
and I can't find anything in the manual addressing this.
Try using a non-super-global array.

Mark Hensler
If there is no answer on Google, then there is no question.