php中的数组管理

Question

Its generally related to a question in magento ..but i think using core php can also give me a wat i want

Im having a looping array issue here,My aray is like this

    Array
    (
        [0] => Array
            (
                [category_id] => 2
                [parent_id] => 1
                [name] => Koffersenkisten
                [is_active] => 0
                [position] => 1
                [level] => 1
                [children] => Array
                    (
                        [0] => Array
                            (
                                [category_id] => 40
                                [parent_id] => 2
                                [name] => Muziek
                                [is_active] => 1
                                [position] => 1
                                [level] => 2
                                [children] => Array
                                    (
                                        [0] => Array
                                            (
                                                [category_id] => 46
                                                [parent_id] => 40
                                                [name] => Gitaar koffer
                                                [is_active] => 1
                                                [position] => 1
                                                [level] => 3
                                                [children] => Array
                                                    (
                                                        [0] => Array
                                                            (
                                                                [category_id] => 50
                                                                [parent_id] => 46
                                                                [name] => Bas gitaar koffer
                                                                [is_active] => 1
                                                                [position] => 1
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                        [1] => Array
                                                            (
                                                                [category_id] => 51
                                                                [parent_id] => 46
                                                                [name] => Electrische gitaar koffer
                                                                [is_active] => 1
                                                                [position] => 2
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                        [2] => Array
                                                            (
                                                                [category_id] => 47
                                                                [parent_id] => 46
                                                                [name] => Akoestische gitaar koffer
                                                                [is_active] => 1
                                                                [position] => 3
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                        [3] => Array
                                                            (
                                                                [category_id] => 49
                                                                [parent_id] => 46
                                                                [name] => Gitaar soft cases
                                                                [is_active] => 1
                                                                [position] => 4
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                        [4] => Array
                                                            (
                                                                [category_id] => 52
                                                                [parent_id] => 46
                                                                [name] => Gitaar gig bags
                                                                [is_active] => 1
                                                                [position] => 5
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                        [5] => Array
                                                            (
                                                                [category_id] => 53
                                                                [parent_id] => 46
                                                                [name] => Pedalboards
                                                                [is_active] => 1
                                                                [position] => 6
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                        [6] => Array
                                                            (
                                                                [category_id] => 48
                                                                [parent_id] => 46
                                                                [name] => Amp Utility Vehicles
                                                                [is_active] => 1
                                                                [position] => 7
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

                                                    )

                                            )

                                        [1] => Array
                                            (
                                                [category_id] => 67
                                                [parent_id] => 40
                                                [name] => Percussie koffer
                                                [is_active] => 1
                                                [position] => 2
                                                [level] => 3
                                                [children] => Array
                                                    (
                                                        [0] => Array
                                                            (
                                                                [category_id] => 73
                                                                [parent_id] => 67
                                                                [name] => Tom koffer
                                                                [is_active] => 1
                                                                [position] => 1
                                                                [level] => 4
                                                                [children] => Array
                                                                    (
                                                                    )

                                                            )

.......


......


>> it goes like this based on the number of categories

How do i get a simple array of the above like this

array('2' => 'Koffersenkisten','40'=> 'Muziek'...........etc); where 2 is the category_id and Koffersenkisten is the name

Answer 1

This function iterates over all items, and recurses when children are found. It passes the output array along at every invocation and appends to it:

function get_cats(array &$output, array $arr)
{
        foreach ($arr as $item) {
                $output[$item['category_id']] = $item['name'];
                if (count($item['children'])) {
                        get_cats($output, $item['children']);
                }
        }
}

// start with empty result
$output = array();
get_cats($output, $a);
print_r($output);