How to update specific index value of array in php laravel?

Question

I'm trying to create add to cart function, and the product is stored inside an array. The array is like this:

array:2 [▼
  0 => array:2 [▼
    "product_id" => "Produk-0036"
    "quantity" => "2"
  ]
  1 => array:2 [▼
    "product_id" => "Produk-0037"
    "quantity" => "3"
  ]
]

My question is how to update the quantity if product_id already exist inside the array?

$get_cart = Cookie::get('user_cart');
if(isset($get_cart)) {
    $cart_array[] = json_decode($get_cart);
}

$cart_array[] = ["product_id" => $request->product_id, "quantity" => $request->quantity];
$cart_json = json_encode($cart_array);
$cart_cookies = Cookie::forever('user_cart', $cart_json);

Using the code above will add new index in the array instead of updating the quantity of already exist product

Thanks

you may get some idea from this. ( the cart is in session there ). stackoverflow.com/questions/69977302/… — D Coder
– D Coder, Commented Nov 18, 2021 at 3:31
@DebasisRath ah! thanks, It works for me. I just need to change the session to cookies — Catto
– Catto, Commented Nov 18, 2021 at 4:24
Good to know Catto, 1 like for that answer would be encouraging for me :) — D Coder
– D Coder, Commented Nov 18, 2021 at 7:03

Mai Truong · Accepted Answer · 2021-11-18 02:52:48Z

1

I think you need update product quantity before Cookie::forever.

You can refer my suggest:

$cart_array = [
        ["product_id" => "Produk-0036", "quantity" => 2],
        ["product_id" => "Produk-0037", "quantity" => 3],
    ];
    
foreach($cart_array as &$cart)
{
  if(isset($cart["product_id"]) && $cart["product_id"] == $request->product_id) 
  {
      $cart["quantity"] += $request->quantity;
  }
}
$cart_json = json_encode($cart_array);
$cart_cookies = Cookie::forever('user_cart', $cart_json);

answered Nov 18, 2021 at 2:52

Mai Truong

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Ali Ragab · Accepted Answer · 2021-11-18 02:57:32Z

1

You may use array_map() function

Try something like this:

$cart_array = [
    [
        "product_id" => "Produk-0036",
        "quantity" => "2"
    ],
    [
        "product_id" => "Produk-0037",
        "quantity" => "3"
    ]
];

$product_id = "Produk-0036";        // product_id to update

$cart_array = array_map(function ($item) use ($product_id) {
    if ($item["product_id"] == $product_id) {
        $item["quantity"] = "5";    // update quantity
    }
    return $item;
}, $cart_array);

var_dump($cart_array); // OUTPUT: updated array

answered Nov 18, 2021 at 2:57

Ali Ragab

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