Laravel sort by keys

Question

I make an array with collections with code:

$hours = Voucher::where('created_at','>=', Carbon::now()->startOfMonth())->get()->groupBy(function($item)
{
  return $item->created_at->format('H');
});

dd($hours);

so I get data like this:

SO keys are hours (00-23).

How I can arrange it starting by 00, 01, 02, 03 ... ...

Answer 1

https://laravel.com/docs/5.6/collections#method-sortkeys

$collection = collect([
    'id' => 22345,
    'first' => 'John',
    'last' => 'Doe',
]);

$sorted = $collection->sortKeys();

---

Update for 5.1

Since you're using Laravel 5.1 and there is no sortKeys method, you can sort the collection before you group it which should result in the keys being in the correct order.

$collection->sort(function($a, $b) {
    return strcmp($a->created_at->format('H'), $b->created_at->format('H'));
})->groupBy(function($item) {
    return $item->created_at->format('H');
});