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@ 2021-02-11T20:42:35Z

<?php

$categorizedOptions = [
    'category' => [
        '1' => [
            'name' => 'c1',
            'attribute' => [
                '1' => [
                    'name' => 'a1',
                    'option' => [
                        '1' => [
                            'name' => 'o1'
                        ],
                        '2' => [
                            'name' => 'o2'
                        ]
                    ]
                ],
                '2' => [
                    'name' => 'a2',
                    'option' => [
                        '3' => [
                            'name' => 'o3'
                        ],
                        '4' => [
                            'name' => 'o4'
                        ]
                    ]
                ]
            ]
        ],
        '2' => [
            'name' => 'c2',
            'attribute' => [
                '3' => [
                    'name' => 'a3',
                    'option' => [
                        '5' => [
                            'name' => 'o5'
                        ],
                        '6' => [
                            'name' => 'o6'
                        ]
                    ]
                ],
                '4' => [
                    'name' => 'a4',
                    'option' => [
                        '7' => [
                            'name' => 'o7'
                        ],
                        '8' => [
                            'name' => 'o8'
                        ]
                    ]
                ]
            ]
        ]
    ]
];

    $final = [];
    foreach ($categorizedOptions as $categories) {
        foreach ($categories as $categoryId => $category) {
            foreach ($category['attribute'] as $attributeId => $attribute) {
                foreach ($attribute['option'] as $optionId => $option) {
                    $final[] = [
                        'category' => $categoryId,
                        'categoryname' => $category['name'],
                        'attribute' => $attributeId,
                        'attributename' => $attribute['name'],
                        'option' => $optionId,
                        'optionname' => $option['name']
                    ];
                }
            }
        }
    }

var_export($final);

var_export: documentation ( source)

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