add data of an index to another index of same array in php

Question

hello I using laravel and magento DB to get data, I want to make tree like structure of following data. Initially when I got data is like this.

Array
(
   [parent] => Array
        (
        [0] => Array
            (
                [entity_id] => 5740
                [name] => Sports
                [parent_id] => 5739
            )

        [1] => Array
            (
                [entity_id] => 6057
                [name] => Football
                [parent_id] => 5740
            )

        [2] => Array
            (
                [entity_id] => 6058
                [name] => American
                [parent_id] => 6057
            )

    )

)

and I want the above data in following format to use in my application.

Array
(
  [parent] => Array
    (
            [0] => Array
            (
                    [entity_id] => 5740
                    [name] => Sports
                    [parent_id] => 5739
                    [child] => Array
                    (
                            [entity_id] => 6057
                            [name] => Football
                            [parent_id] => 5740
                            [child]=> Array
                            (
                                    [entity_id] => 6058
                                    [name] => American
                                    [parent_id] => 6057
                            )
                    )
            )

    )

)

can anyone please help me in this.

You're probably going to need to post your model relationships and the code your using to actually get the data to get an accurate answer. — Steve O
– Steve O, Commented Apr 11, 2014 at 9:55

mleko · Accepted Answer · 2014-05-02 11:37:46Z

2

Solution handling unordered hierarchies

function hierarchize($data){
    $parentLess = [];
    $map = [];

    foreach($data['parent'] as &$entity){
        $id = $entity['entity_id'];
        $parentId = $entity['parent_id'];

        $map[$id] = &$entity;

        if(isset($map[$parentId])){
            $map[$parentId]['child'][] = &$entity;
        }else{
            $parentLess[$parentId][] = &$entity;
        }

        if(isset($parentLess[$id])){
            $entity['child'] = &$parentLess[$id];
            unset($parentLess[$id]);
        }
    }

    return $parentLess;
}

https://eval.in/145508

answered May 2, 2014 at 11:37

mleko

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