Answer by deceze for Sort based on multiple criteria on keys and values

There are perfectly suitable approaches detailed here, but considering the actual structure of your array, this probably requires a bit more explanation. Specifically, here's how you can sort by both keys and values:

uksort($array, function ($siteA, $siteB) use ($array) {
    $priceA = $array[$siteA]['price'];
    $priceB = $array[$siteB]['price'];

    if ($priceA == $priceB) {
        return strcmp($siteA, $siteB);
    }
    if (!$priceB) {
        return -1;
    }
    if (!$priceA) {
        return 1;
    }
    return $priceB - $priceA;
});

You might need to adjust the specific comparisons and return logic here, but this illustrates the approach.