What is the best way to add an Item x of total to each item while sorting an array in php

Solution:

You can try something like that:

// Get array of all order ids.
$orderIds = array_column($array, 'order_id');
// Sort $array by order ids.
array_multisort(
    array_column($array, 'driver_id'),
    array_column($array, 'product_id'),
    $orderIds,
    $array
);
// Count order ids occurances.
$orderIdsCounts = array_count_values($orderIds);

$counter = 0;
$array = array_map(function ($orderId, $item) use (&$counter, $orderIdsCounts) {
    $counter += 1;

    $item['sequence'] = "$counter of {$orderIdsCounts[$orderId]}";

    // Reset the counter if order id total is reached.
    $counter = $counter === $orderIdsCounts[$orderId] ? 0 : $counter;

    return $item; 
}, $orderIds, $array);
Copy code

Here is working demo.

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