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            [parent_category] => Array
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                    [slug] => computer-technology
                    [name] => Computer and Technology
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            [subcategories] => Array
                (
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                            [name] => Microsoft Excel
                            [slug] => microsoft-excel
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            [parent_category] => Array
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                    [name] => Engineering
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            [subcategories] => Array
                (
                    [0] => Array
                        (
                            [name] => Mechanical Engineering
                            [slug] => mechanical-engineering
                            [id] => 1881
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                )

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            [parent_category] => Array
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                    [slug] => math
                    [name] => Math
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            [subcategories] => Array
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                        (
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                            [slug] => algebra-1
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                            [slug] => algebra-2
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                            [slug] => calculus
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                        (
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                            [slug] => differential-equations
                            [id] => 1731
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                        (
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                            [slug] => geometry
                            [id] => 1727
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                            [slug] => linear-algebra
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                            [slug] => prealgebra
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                            [slug] => precalculus
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                            [slug] => trigonometry
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)