Pinq\ITraversable::orderByAscending PHP Метод

    public function orderByAscending(callable $function);

 /**
  * @dataProvider people
  */
 public function testOrderByMultipleColumns(\Pinq\ITraversable $traversable, array $data)
 {
     $orderedNames = $traversable->orderByAscending(function ($i) {
         return $i['firstName'];
     })->thenByDescending(function ($i) {
         return $i['lastName'];
     })->implode(':', function ($i) {
         return $i['firstName'] . ' ' . $i['lastName'];
     });
     $this->assertEquals('Alex Katter:Beth Baronksy:Casy Denali:Daniel Farmer:Daniel Dekresta:Dave Desopolous:David Faller:Hugo Tesserat:Sandy Williams:Zoe Black', $orderedNames);
 }