Decoding JSON.stringify in PHP

Question

I'm sending the following string trough a javascript function into a PHP file:

    function showcart()
{
    document.getElementById('cart').value = JSON.stringify(paypal.minicart.cart.items());
}

On PHP side the string comes as follows:

echo $_POST['cart'];

[{"_data":{"cmd":"_cart","add":"1","item_name":"FILA 1010302","item_image":"images/1010302-1.png","amount":99,"discount_amount":"50.00","submit":"Adicionar ao carrinho","quantity":2,"href":"http://teste/index.html#5"},"_options":[],"_discount":100,"_amount":99,"_total":98,"_eventCache":{"change":[[null,null]]}},{"_data":{"cmd":"_cart","add":"1","item_name":"FILA 1010575","item_image":"images/1010575-1.png","amount":99,"discount_amount":"50.00","submit":"Adicionar ao carrinho","quantity":1,"href":"http://teste/index.html#5"},"_options":[],"_discount":50,"_amount":99,"_total":49,"_eventCache":{"change":[[null,null]]}},{"_data":{"cmd":"_cart","add":"1","item_name":"FILA 1010707","item_image":"images/1010707-1.png","amount":99,"discount_amount":"50.00","submit":"Adicionar ao carrinho","quantity":1,"href":"http://teste/index.html#5"},"_options":[],"_discount":50,"_amount":99,"_total":49,"_eventCache":{"change":[[null,null]]}},{"_data":{"cmd":"_cart","add":"1","item_name":"FILA SCM00514","item_image":"images/scm00514-1.png","amount":99,"discount_amount":"50.00","submit":"Adicionar ao carrinho","quantity":1,"href":"http://teste/index.html#5"},"_options":[],"_discount":50,"_amount":99,"_total":49,"_eventCache":{"change":[[null,null]]}}]

What I'm looking for is to save each field into separate variables, for example:

item = 1 item_name = FILA 1010302, item_image = images/1010302-1.png quantity = 2

item = 2 item_name = FILA 1010575, item_image = images/1010575-1.png quantity = 1

I'm trying several ways using json_decode and html_entity_decode but I just can't reach the desired output.

Can someone help me on this, I'm assuming this is a fairly easy task, but I'm new to PHP, please try to understand.

Thank you in advance!

I'm sorry the question was not clear enough, I have edited it. The goal is to get some information according to the position of the array. @AbraCadaver — Tiago Silva
– Tiago Silva, Commented Mar 30, 2020 at 21:52

Raymond Mutyaba · Accepted Answer · 2020-03-30 22:15:58Z

2

Using an online JSON parser, http://json.parser.online.fr/ , I can see that $_POST['cart'] is an array of 5 objects. Within each object there are 6 more objects (_data, _options, _discount, etc.). Then within the _data object there are nine items. In order to get to the values you would need to look at where they are in that nest of JSON objects.

$item_name = json_decode($_POST['cart'], true)[0]["_data"]["item_name"];

$array_of_items_in_cart = json_decode($_POST['cart'], true);
$first_item_in_cart = array_of_items_in_cart[0];
$name_of_first_item_in_cart = first_item_in_cart["_data"]["item_name"];
$first_item_discount = first_item_in_cart["_discount"];

edited Mar 30, 2020 at 22:15

answered Mar 30, 2020 at 22:01

Raymond Mutyaba

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3 Comments

Tiago Silva Over a year ago

Thank you for your advice @Raymond Mutyaba, but isn't this javascript code? What I'm looking for is too decode this on php side. This code on PHP won't give an error?

Shaun Forsyth Over a year ago

As pointed out in the answer "json_decode" is the php command to take JSON and convert it to an array or object

Raymond Mutyaba Over a year ago

Sorry about that. I have been writing in javascript lately. I have edited the code to use PHP. Using true inside json_decode turns $_POST['cart'] into an array, and without true it becomes an object.

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