[RESOLVED] Accessing specific array values

[kingbeastie]

Hi all,

My first post here - I'm sure I'll find a lot of helpful advice and people here.

At the moment I'm struggling with performing some calculations on array values.
What I'm trying to do is get some values from an array that holds shopping cart details than add them together but only for certain items.

Say I have an array that has 4 entries:
[0]([product_id] => 100 [quantity] =>1)
[1]([product_id] => 104 [quantity] =>3)
[2]([product_id] => 117 [quantity] =>4)
[3]([product_id] => 100 [quantity] =>2)

and a variable that holds a pre-determined value:
$prod_id = 100;

I want to get all the quantities where the product id is equal to the variable value, so in this case it would be 1 and 2, then i want to total these values so 1+2=3

The final value i am aiming to get would be 3 in this case.

I currently have a loop which accesses the array then creates an array of of the product id's:

for($i=0;$i<=count($SESSION['shoppingCart']);$i++) {
$new_array = array($SESSION['shoppingCart'][$i]['product_id']);
}

What I'm struggling with is getting only the array info where the product id is equal to $prod_id.

Can anyone help or point me in the right direction?

Many thanks,

Steve

[dzysyak]

Sorry, problem is not clear to me. Actually I do not see any problem here.

Here is some code:

$Total=0;
foreach($_SESSION['shoppingCart'] as $v) 
if($v['product_id']==$prod_id){
    $Total+=$v['quantity']; 
}

[kingbeastie]

Hi,

Thanks very much for your response, I have just fixed the issue tho (probably not in the most efficient manor tho!)

The problem came in trying to go thru the array to get only the correct products then accessing the quantities required and adding them, this is part of a huge loop that runs if a certain discount code has been entered.

This is what I done, it might come in handy for someone else:

$correct_item_quantity = 0;
							for($i=0;$i<=count($_SESSION['shoppingCart']);$i++) {
							   $new_array = array($_SESSION['shoppingCart'][$i]);
							   // for each item in the cart check if its product id is the same as the item on offer
							   foreach ($new_array as $value){
							   	if($value['product_id'] == $item['product_id']){
							   	// create an array of the quantities of only correct items
							   	$total_q_array = array($value['quantity']);
							   	foreach ($total_q_array as $quantities){
							   		// add the quantities together
							   		$correct_item_quantity += $quantities;
								   	}
								   	break;
								   }
								}
							}

The shoppingCart array contains many other details which made it a little difficult and also that this was part of a much bigger loop.

Thanks again for your help, I've to push on with next part of this application but will try to come back to this part as I've probably not done this in the the best way.

Thanks again,

Steve