php multi session array update

Question

I want to update the product inventory would be glad if you help I could not. My product list array

$_SESSION['item'];
Array ( 
[0] => Array ( [product_id] => 9 [stock] => 20 ) 
[1] => Array ( [product_id] => 8 [stock] => 30 ) 
[2] => Array ( [product_id] => 7 [stock] => 26 ) 
[3] => Array ( [product_id] => 6 [stock] => 42 ) 
)

I do

$product_id = mysql_real_escape_string($_POST['product_id']);
$stock  = mysql_real_escape_string($_POST['stock']);
$found = false;
foreach($_SESSION['item'] as $product){
    if($product_id == $product['product_id']) {
        $found = true;
        break;
    }
}

if($found){
    $_SESSION['item'][$product_id]['stock'] += $stock;
}else{

    // go get new product and add to $_SESSION['item']
}

Well and what's the question? Where is an error? What's does not work? — David Ferenczy Rogožan
– David Ferenczy Rogožan, Commented May 12, 2014 at 23:49
its not going to work, stock is not a key of product_id i would restructure the array using the product_id as the first level key — user557846
– user557846, Commented May 12, 2014 at 23:52

David Ferenczy Rogožan · Accepted Answer · 2014-05-12 23:54:32Z

1

Try this:

$product_id = mysql_real_escape_string($_POST['product_id']);
$stock  = mysql_real_escape_string($_POST['stock']);
$found = false;
foreach($_SESSION['item'] as $index => $product){
    if($product_id == $product['product_id']) {
        $found = true;
        break;
    }
}

if($found){
    $_SESSION['item'][$index]['stock'] += $stock;
}else{
    // go get new product and add to $_SESSION['item']
}

Explain: the $_SESSION['item'] array is not indexed by the product_id. So you have to get and store an index of the current array item in the foreach loop and use it to update of the $_SESSION['item'] array.

answered May 12, 2014 at 23:54

David Ferenczy Rogožan

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2 Comments

David Ferenczy Rogožan Over a year ago

Great, I'm pleased :) As reward you can vote for my answer and mark it as answer. Thank you.

Yunus Kocabay Over a year ago

How points are given :) I'm tossing up arrow says 15 people need more

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