按特定键DESC对包含数组的对象进行排序

Question

I'm using the https://github.com/brunogaspar/cartify library to manage my Cart. Things are good, except the fact that I need to be able to sort the items contained within the array by the price key DESC

If I'm using the Cartify::cart()->contents() , here's an example of one of the items contained:

array(
    'id'      => 'sku_123ABC',
    'qty'     => 1,
    'price'   => 39.95,
    'name'    => 'T-Shirt',
    'options' => array(
        'size'  => 'L',
        'color' => 'Red'
    )

As you can see, there's a price key ... and if I can't sort on the class level, I'll have to sort these items after the fact.

Answer 1

You can do this using usort and a custom compare function. Something like this:

usort($myArray, function ($a, $b) {
    if ($a['price'] == $b['price']) {
        return 0;
    }
    return ($a['price'] < $b['price']) ? 1 : -1;
});

Not the most elegant solution to hard-code the key into the sort function, but it will work.