Updating existing session array

[micmac]

Hi all,
How do i go about updating an existing session?
This is what i have:

$prod_id = $_POST['prod_id'];

if (isset($_SESSION['cart'])) {

  foreach ($_SESSION['cart'] as $value) {
    if ($value[0] == $prod_id){
      $qty = $value[1]+$_POST['qty'];
      // update exixting session here

} else {
  $qty = $_POST['qty'];
  $cart = $_SESSION['cart'];
  $cart[] = array($prod_id, $qty);  		        

  $_SESSION['cart'] = $cart;
}
}

} else {

$qty = $_POST['qty'];
$cart = $_SESSION['cart'];
$cart[] = array($prod_id, $qty);  		        

$_SESSION['cart'] = $cart;
}		

Cheers

[bpat1434]

Well, I'd say you should use this type of array:

$SESSION['cart']['qty'] = $qty;
$SESSION['cart']['prod_id'] = $prod_id;

So, your code (cleaner) can look like:

<?php
$prod_id = $_POST['prod_id'];

if (isset($_SESSION['cart'])) {

foreach ($_SESSION['cart'] as $value) {
	if ($value[0] == $prod_id){
		$qty = $value[1]+$_POST['qty'];
		// update exixting session here
		$value[1] = $qty;

	} else {
		$qty = $_POST['qty'];
		$cart = $_SESSION['cart'];
		$cart[] = array($prod_id, $qty);                  

		$_SESSION['cart'] = $cart;
	}
}
}

} else {

$qty = $_POST['qty'];
$cart = $_SESSION['cart'];
$cart[] = array($prod_id, $qty);                  

$_SESSION['cart'] = $cart;
}

?>

And some alternate code if that doesn't work as you expect it:

<?php
$prod_id = $_POST['prod_id'];

if (isset($_SESSION['cart'])) {

foreach ($_SESSION['cart'] as $value) {
	if ($value[0] == $prod_id){
		$qty = $value[1]+$_POST['qty'];
		// update exixting session here
		$value[1] = $qty;

	} else {
		$qty = $_POST['qty'];
		$cart = $_SESSION['cart'];
		$cart[] = array($prod_id, $qty);                  

		$_SESSION['cart'] = array_push($_SESSION['cart'], array($prod_id, $qty));
	}
}
}

} else {

$qty = $_POST['qty'];                  

$_SESSION['cart'] = array($prod_id, $qty);
}

?>

You'll notice I use the array_push() function to add to the current array (which is easier that doing what you were doing).

~Brett

[micmac]

Thanks for the reply.
Still having some difficulty getting it to work.
I have changed my original code a little:

		if (!empty($_POST['prod_id'])) {

	$prod_id = $_POST['prod_id'];
    $qty = $_POST['qty'];			

	foreach($_SESSION['cart'] as $key => $value){
	$prod_array[] = $value[0];
	}

	if(in_array($prod_id,$prod_array)){
    // this is where i want to make the update to the session depending on the key

	} else {

	$cart = $_SESSION['cart'];
	$cart[] = array($prod_id, $qty);
	$_SESSION['cart'] = $cart;		

	}      

	echo "<pre>";
	print_r($_SESSION['cart']);
    echo "</pre>";  	
    exit;

	}

Lets assume i have added 3 different products to the cart so the output will look like this:

Array
(
    [0] => Array
        (
            [0] => 1
            [1] => 1
        )

[1] => Array
    (
        [0] => 51
        [1] => 5
    )

[2] => Array
    (
        [0] => 77
        [1] => 1
    )

)

Now, if i where to add another product that already existed in the cart (ie. it has the same prod_id, for example 51) i want it to update the existing session (in this case if i tried to add another prod_id with the value 51 it would update the array key [1] with the qty value.
Any ideas, this has been bugging me for days.

Cheers