Eloquent sortBy - Specify asc or desc
Laravel 5
https://laravel.com/docs/5.8/collections#method-sortby
Laravel 4
https://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method_sortBy
Usage
$collection->sortBy('field', [], true); // true for descending
To sort by ASC: Laravel Docs - sortBy()
$collection->sortBy('field');
To sort by DESC: Laravel Docs - sortByDesc()
$collection->sortByDesc('field');
In 4.2, the second parameter needs to be an int, SORT_REGULAR is default
https://laravel.com/api/4.2/Illuminate/Database/Eloquent/Collection.html#method_sortBy
$collection->sortBy('field', SORT_REGULAR, true); //true for descending