Use groupBy on Collections with Custom Callback Function

If you want to group result by some condition which isn’t a direct column in your database, you can do that by providing a closure function.

For example, if you want to group users by day of registration, here’s the code:

$users = User::all()->groupBy(function($item) {
    return $item->created_at->format('Y-m-d');
});

⚠️ Notice: it is done on a Collection class, so performed AFTER the results are fetched from the database.