FOF30\Utils\Collection::sortByDesc PHP Метод

    public function sortByDesc($callback, $options = SORT_REGULAR)
    {
        return $this->sortBy($callback, $options, true);
    }

 public function testSortBy()
 {
     $data = new Collection(array('foo', 'bar'));
     $data = $data->sortBy(function ($x) {
         return $x;
     });
     $this->assertEquals(array('bar', 'foo'), array_values($data->all()));
     $data = new Collection(array('bar', 'foo'));
     $data->sortByDesc(function ($x) {
         return $x;
     });
     $this->assertEquals(array('foo', 'bar'), array_values($data->all()));
 }