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@ 2019-12-23T12:44:26Z

<?php

$data = array(
    array
    (
        'category_id' => 20,
        'category_name' => 'Category 1',
        'main_category' => 0,
        'sub_categories' => array(
                array
                    (
                        'category_id' => 25,
                        'category_name' => 'Category 1.3',
                        'main_category' => 20,
                        'sub_categories' => [],
                    ),
                array
                    (
                        'category_id' => 26,
                        'category_name' => 'Category 1.4',
                        'main_category' => 20,
                        'sub_categories' => array
                            (
                                array
                                    (
                                        'category_id' => 30,
                                        'category_name' => 'Category 1.4.1',
                                        'main_category' => 26,
                                        'sub_categories' => []
                                    ),
                                array
                                    (
                                        'category_id' => 31,
                                        'category_name' => 'Category 1.4.2',
                                        'main_category' => 26,
                                        'sub_categories' => []
                                    )
                            )
                    ),
        )
    ),
    array
        (
            'category_id' => 19,
            'category_name' => 'Category 2',
            'main_category' => 0,
            'sub_categories' => []
        )
    );


function getChildren($data,$parents,&$result){
    foreach($data as $current_category){
        $temp = [];
        $temp['category_id'] = $current_category['category_id'];
        $new_cat_sequence =  array_merge($parents,[$current_category['category_name']]);
        $temp['category_name'] = implode(" -> ",$new_cat_sequence);
        $result[] = $temp;
        getChildren($current_category['sub_categories'],$new_cat_sequence,$result);
    }
}

$result = [];
getChildren($data,[],$result);

print_r($result);

Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: Array ( [0] => Array ( [category_id] => 20 [category_name] => Category 1 ) [1] => Array ( [category_id] => 25 [category_name] => Category 1 -> Category 1.3 ) [2] => Array ( [category_id] => 26 [category_name] => Category 1 -> Category 1.4 ) [3] => Array ( [category_id] => 30 [category_name] => Category 1 -> Category 1.4 -> Category 1.4.1 ) [4] => Array ( [category_id] => 31 [category_name] => Category 1 -> Category 1.4 -> Category 1.4.2 ) [5] => Array ( [category_id] => 19 [category_name] => Category 2 ) )

preferences:dark modelive previewkey bindings

181.87 ms | 409 KiB | 5 Q