Add new column into the collections.

Add new column into the collections using map function in laravel.

$collection = collect([
    [
        'price' => 2561,
        'tax' => 50
    ],
    [
        'price' => 3500,
        'tax' => 100
    ]
]);

return $collection->map(function ($items) {
    $items['total_sum'] =  $items['price'] + $items['tax'];
    return $items;
});



===============================================================================


$collection = collect([
    [
        'price' => 2561,
        'tax_percent' => 5
    ],
    [
        'price' => 3500,
        'tax_percent' => 5
    ]
]);

return $collection->map(function ($items) {
    $items['tax'] =  $items['price'] * $items['tax_percent'] / 100;
    $items['total_sum'] =  $items['price'] + $items['tax'];
    return $items;
});