How to parse nested JSON sent via AJAX in PHP

Question

Say I have this AJAX sent via jQuery to a PHP server

$.ajax({
    url: woocommerce_admin_meta_boxes.ajax_url,
    data: data,
    type: 'POST',
    success: function (res) {
        if (res.success) {
            location.reload();
        }
    }
});

and data looks like this

data = {
    order_id: woocommerce_admin_meta_boxes.post_id,
    order_items : [
        {
            order_item_id: 69420,
            amount: 420
        },
        {
            order_item_id: 42069,
            amount: 69
        }
    ]
};

What I have found out is by using PHP's $_POST, I can access the order id like this

$order_id = $_POST['order_id'];

However, I am not sure of how I can access stuff inside order_items from data. From what I've seen in this stackoverflow post, there's a PHP function called json_decode(), but I'm not so sure of how to use this together with AJAX or $_POST.

Send data like JSON.stringify(data) in ajax and decode this in php using json_decode() — Haresh Makwana
– Haresh Makwana, Commented Oct 6, 2020 at 5:23

Barmar · Accepted Answer · 2020-10-06 05:43:34Z

2

$.ajax() doesn't use JSON encoding, it sends URL-encoded format, so there's no need to use json_decode().

To access the nested data, just use ordinary array accessing in the $_POST variable.

foreach ($_POST['order_items'] as $item) {
    echo "Item ID: " . $item['order_item_id'] . "<br>";
    echo "Amount: " . $item['amount'] . "<br>";
}

answered Oct 6, 2020 at 5:43

Barmar

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