Array
(
    [1699] => Array
        (
            [parent_category_id] => 1699
            [parent_category] => Array
                (
                    [id] => 1699
                    [slug] => languages
                    [name] => Languages
                )

            [subcategories] => Array
                (
                    [0] => Array
                        (
                            [name] => Russian
                            [slug] => russian
                            [id] => 1709
                        )

                    [1] => Array
                        (
                            [name] => Spanish
                            [slug] => spanish
                            [id] => 1703
                        )

                )

        )

    [1785] => Array
        (
            [parent_category_id] => 1785
            [parent_category] => Array
                (
                    [id] => 1785
                    [slug] => music
                    [name] => Music
                )

            [subcategories] => Array
                (
                    [0] => Array
                        (
                            [name] => Music Theory
                            [slug] => music-theory
                            [id] => 1787
                        )

                    [1] => Array
                        (
                            [name] => Piano
                            [slug] => piano
                            [id] => 1789
                        )

                )

        )

)