Array
(
    [1802] => Array
        (
            [parent_category_id] => 1802
            [parent_category] => Array
                (
                    [id] => 1802
                    [slug] => computer-technology
                    [name] => Computer and Technology
                )

            [subcategories] => Array
                (
                    [0] => Array
                        (
                            [name] => C
                            [slug] => c
                            [id] => 1827
                        )

                    [1] => Array
                        (
                            [name] => Computer Science
                            [slug] => computer-science
                            [id] => 1814
                        )

                    [2] => Array
                        (
                            [name] => Python
                            [slug] => python
                            [id] => 1820
                        )

                    [3] => Array
                        (
                            [name] => SQL
                            [slug] => sql
                            [id] => 1822
                        )

                )

        )

    [1723] => Array
        (
            [parent_category_id] => 1723
            [parent_category] => Array
                (
                    [id] => 1723
                    [slug] => math
                    [name] => Math
                )

            [subcategories] => Array
                (
                    [0] => Array
                        (
                            [name] => Calculus
                            [slug] => calculus
                            [id] => 1730
                        )

                    [1] => Array
                        (
                            [name] => Discrete Math
                            [slug] => discrete-math
                            [id] => 1732
                        )

                    [2] => Array
                        (
                            [name] => Linear Algebra
                            [slug] => linear-algebra
                            [id] => 1733
                        )

                    [3] => Array
                        (
                            [name] => Mathematica
                            [slug] => mathematica
                            [id] => 1738
                        )

                    [4] => Array
                        (
                            [name] => SAT Math
                            [slug] => sat-math
                            [id] => 1740
                        )

                )

        )

)