The whereIn method verifies that a given column's value is contained within the given array.
If you only need one, just use where to select specific id
$query->where('category_id', 4)->get();
For selecting multiple, use whereIn :
$query->whereIn('category_id', [1, 2, 3])
->get();
source:https://laravel.com/docs/8.x/queries
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