FOF30\Utils\Collection::flatten PHP Метод

    public function flatten()
    {
        return new static(array_flatten($this->items));
    }

 public function testFlatten()
 {
     $c = new Collection(array(array('#foo', '#bar'), array('#baz')));
     $this->assertEquals(array('#foo', '#bar', '#baz'), $c->flatten()->all());
 }