inquiry on a foreach loop code

[steelheart38]

im having a problem with this code,it seems simple but it doesnt give the right output.i created a session array and even f a value is already added,the foreach loop displays an error (invalid argument) heres the code

<?php
include ('db.inc');
session_start();

if($scbpid)
{
echo "scbpid = $scbpid <br/>";

if(!isset($HTTP_SESSION_VARS['cart']))
{
	$HTTP_SESSION_VARS['cart']=array();	
	$HTTP_SESSION_VARS['total_price']='0.00';
	echo "cart created<br>";
}

if(isset($HTTP_SESSION_VARS['cart'][$scbpid]))
{
	$HTTP_SESSION_VARS['cart'][$scbpid]++;
	echo "quantity added <br>";
}

else
{
	$HTTP_SESSION_VARS['cart'][$scbpid]=1;
	echo "new record added<br>";
}
printf(" quantity = %s <br>",($HTTP_SESSION_VARS['cart'][$scbpid]));

}

if ($HTTP_SESSION_VARS['cart']&&array_count_values($HTTP_SESSION_VARS['cart']))
{
echo "SCBPid are the following:";

foreach ($cart as $scbpid => $qty)
{
	print_r ($scbpid);
}

}
else
{
echo "cart empty";
}

?>

an $scbpid is passed from the previous page and the first time this page is encountered,this is wat appears

scbpid = 1
cart created
new record added
quantity = 1
SCBPid are the following:
Warning: Invalid argument supplied for foreach() in C:\apachefriends\xampp\htdocs\cart.php on line 40

but when i come back to this page again thus incrementing the quantity, the foreach loop works. so i was wondering why it displays the image at first encounter

need help guys..c",) thnks

[laserlight]

foreach ($cart as $scbpid => $qty)

Where does $cart come from?

[steelheart38]

i created the $cart to serve a a temporary array for a shopping cart application. its key would be $scbpid (product id)and the value would be $qty (quantity).

the creation of the $cart is included in the code. the problem is even if a value of 1 is already assigned to [$cart][$scbpid], the foreach loop seems to have an error

[laserlight]

the creation of the $cart is included in the code.

I cant seem to find it though.

Are you using $cart where you intend to use $HTTP_SESSION_VARS['cart']?

Nowadays we use $_SESSION instead of $HTTP_SESSION_VARS, and we assume that register_globals is set to off.

[steelheart38]

if(!isset($HTTP_SESSION_VARS['cart']))
{
$HTTP_SESSION_VARS['cart']=array();
$HTTP_SESSION_VARS['total_price']='0.00';
echo "cart created<br>";
}
if(isset($HTTP_SESSION_VARS['cart'][$scbpid]))
{
$HTTP_SESSION_VARS['cart'][$scbpid]++;
echo "quantity added <br>";
}
else
{
$HTTP_SESSION_VARS['cart'][$scbpid]=1;
echo "new record added<br>";
}

sorry but im really a newbie in php.as i know,line 3 creates the $cart? and line 10 adds to the value if ['cart'][$scbpid] it exist?

iv tried 2 use $_SESSION too but it works the same. at the first access of the page, line 14 and 15 is reached but the foreach line causes an error. at this point $cart already have a value so i expected that the foreach would not cause the invalid argument error.

am i making sense? i hope u cud bear with me.thnks

[laserlight]

as i know,line 3 creates the $cart?

It doesnt, unless register_globals is set to on in php.ini

Just use $_SESSION['cart'] or $HTTP_SESSION_VARS['cart']

[steelheart38]

Just use $_SESSION['cart'] or $HTTP_SESSION_VARS['cart'] [/B]

how could i set the $cart as an array f i use $SESSION['cart']?

[laserlight]

Use multi-dimensional arrays, e.g.

$_SESSION['cart'][$scbpid]

[steelheart38]

got it =)

i chnged all reference to $cart to $SESSION['cart'] and i also tried 2 declare $cart=$SESSION['cart'] at the start.both ways it works

thnks a lot and more power.c",)