如何使用键更改特定多维数组的值？

Question

I'm facing an issue in a multi dimensional array. I need to change the quantity of a specific product set in session if both ID and variants of the selection are the same of one of session product, and increment by 1 this product.

the product I'm posting $newproduct

Array
(
    [id] => 2
    [title] => Vewlix 1080p (red and white)
    [image] => amazing-modern-villa-Freshome-02.jpg
    [variants] => Array
        (
            [0] => Array
                (
                    [id] => 2
                    [option_name] => Panel 2 players (+50 euros)
                    [option_price] => 50.00
                )

        )

    [quantity] => 1
    [unit_price] => 1950.00
    [price] => 2000
)

Here is my $_SESSION['shopping_cart']:

Array
(
    [0] => Array
        (
            [id] => 2
            [title] => Vewlix 1080p (red and white)
            [image] => amazing-modern-villa-Freshome-02.jpg
            [variants] => Array
                (
                    [0] => Array
                        (
                            [id] => 1
                            [option_name] => Panel 1 player
                            [option_price] => 0.00
                        )

                )

            [quantity] => 2
            [unit_price] => 1950.00
            [price] => 1950
        )

    [1] => Array
        (
            [id] => 2
            [title] => Vewlix 1080p (red and white)
            [image] => amazing-modern-villa-Freshome-02.jpg
            [variants] => Array
                (
                    [0] => Array
                        (
                            [id] => 2
                            [option_name] => Panel 2 players (+50 euros)
                            [option_price] => 50.00
                        )

                )

            [quantity] => 1
            [unit_price] => 1950.00
            [price] => 2000
        )

    )

The code:

$products_in_cart = array_column($_SESSION["shopping_cart"], "id");
$key = array_search($newproduct["id"], $products_in_cart);

if ($key !== false) {
    $variants_in_cart = array_column($_SESSION["shopping_cart"][$key]["variants"], "id");
    $new_variants = array_column($newproduct["variants"], "id");
    sort($variants_in_cart);
    sort($new_variants);

    if (count(array_diff($variants_in_cart, $new_variants)) === 0) {
        $_SESSION["shopping_cart"][$key]["quantity"] += 1;
    } else {
        $_SESSION["shopping_cart"][] = $newproduct;
    }
} else {
    $_SESSION["shopping_cart"][] = $newproduct;
}

For now I have the ID and variants comparaison working, but when similiar product is posted, instead of incrementing only the specific product with same id/variants, it increments all products quantities of my session by +1.

How can I add +1 only to the product with exact same ID / variants only ? I think my [$key] doesn't work, as it should be the filter to only increment the proper product quantity

Answer 1

No need to loop over the array like that. Start by getting a list of the IDs in the shopping cart already. If there's a match, pull the key from that list, check the variants, and increment. Otherwise, just add it.

<?php
$_SESSION["shopping_cart"] = json_decode('[{"id": 2, "quantity": 1, "variants": [{"option_id": 3}, {"option_id": 9}]}, {"id": 1, "quantity": 1, "variants": [{"option_id": 5}]}]', true);
$newproduct = json_decode('{"id": 2, "variants": [{"option_id": 3}, {"option_id": 9}]}', true);

$products_in_cart = array_column($_SESSION["shopping_cart"], "id");
$key = array_search($newproduct["id"], $products_in_cart);

if ($key !== false) {
    $variants_in_cart = array_column($_SESSION["shopping_cart"][$key]["variants"], "option_id");
    $new_variants = array_column($newproduct["variants"], "option_id");
    sort($variants_in_cart);
    sort($new_variants);
    if (count(array_diff($variants_in_cart, $new_variants)) === 0) {
        $_SESSION["shopping_cart"][$key]["quantity"] += 1;
    } else {
        $_SESSION["shopping_cart"][] = $newproduct;
    }
} else {
    $_SESSION["shopping_cart"][] = $newproduct;
}

var_dump($_SESSION["shopping_cart"]);

Output:

array(2) {
  [0] =>
  array(3) {
    'id' =>
    int(2)
    'quantity' =>
    int(2)
    'variants' =>
    array(2) {
      [0] =>
      array(1) {
        ...
      }
      [1] =>
      array(1) {
        ...
      }
    }
  }
  [1] =>
  array(3) {
    'id' =>
    int(1)
    'quantity' =>
    int(1)
    'variants' =>
    array(1) {
      [0] =>
      array(1) {
        ...
      }
    }
  }
}