Laravel: dynamic where clause with Elouquent

It’s easy with Laravel. Just do something like this:

$query = User::query();

if ($this == $that) {
  $query = $query->where('this', 'that');
}

if ($this == $another_thing) {
  $query = $query->where('this', 'another_thing');
}

if ($this == $yet_another_thing) {
  $query = $query->orderBy('this');
}

$results = $query->get();