Expand multidimensional array with keypath values to have nested subarrays

Question

I have one array in two format. I want to change array from

Array
(
    [step_number] => 4
    [app_id] => Array
        (
            [0] => 2
            [1] => 3
        )
    [formdata] => Array
        (
            [0] => Array
                (
                    [name] => app_id[]
                    [value] => 2
                )
            [1] => Array
                (
                    [name] => app_id[]
                    [value] => 3
                )
            [2] => Array
                (
                    [name] => fieldval[2][2][]
                    [value] => 1
                )
            [3] => Array
                (
                    [name] => fieldval[3][3][]
                    [value] => 200
                )
            [4] => Array
                (
                    [name] => fieldval[3][3][]
                    [value] => day
                )
            [5] => Array
                (
                    [name] => title
                    [value] => new plan
                )
            [6] => Array
                (
                    [name] => feature_plan
                    [value] => 3
                )
            [7] => Array
                (
                    [name] => plan_type
                    [value] => free
                )
            [8] => Array
                (
                    [name] => price
                    [value] => 
                )
            [9] => Array
                (
                    [name] => sell_type
                    [value] => us
                )
       )
)

this format to

Array
(
    [app_id] => Array
        (
            [0] => 2
            [1] => 3
        )

    [fieldval] => Array
        (
            [2] => Array
                (
                    [2] => Array
                        (
                            [0] => 1
                        )

                )

            [3] => Array
                (
                    [3] => Array
                        (
                            [0] => 200
                            [1] => day
                        )

                )

        )

    [title] => new plan
    [feature_plan] => 3
    [plan_type] => free
    [price] => 
    [sell_type] => us
)

these are are one array into two format. i have data in to first array format and i want to change that format to second array type format. please tell me how i am trying this for 2 days but not succeed.

If you use var_export for your array dumps, it will make it easier to provide a solution. — Progrock
– Progrock, Commented Apr 9, 2016 at 11:32
@Ryan Vincent echo '<pre>'; // $arr = array(); $formdata = $_POST['formdata']; foreach($formdata as $key=>$val){ $test = $val['name']; $$test = array(); $$test = $val['value']; echo ${$test}; //$arr[] = $$test; //array_push($$test,$val['value']); //echo str_replace('[]','',$$test); die; //print_r($$test); die; //$newarray = array_merge($arr, $$test); //print_r($arr); die; } print_r($arr); print_r($_POST); die('kk'); i have tried this or many more these type but not succed — Vijay Pratap Singh
– Vijay Pratap Singh, Commented Apr 9, 2016 at 11:59

trincot · Accepted Answer · 2016-04-09 12:48:32Z

Here is a function you could use to produce that conversion:

function convert_formdata($input) {    
    $output = array();
    foreach($input['formdata'] as $data) {
        $keys = preg_split("#[\[\]]+#", $data['name']);
        $value = $data['value'];
        $target = &$output;
        foreach($keys as $key) {
            // Get index for "[]" reference
            if ($key == '') $key = count($target);
            // Create the key in the parent array if not there yet
            if (!isset($target[$key])) $target[$key] = array();
            // Move pointer one level down the hierarchy
            $target = &$target[$key];
        }
        // Write the value at the pointer location
        $target = $value;
    }
    return $output;
}

You would call it like this:

$output = convert_formdata($input);

See it run on eval.in for the given input. The output is:

array (
  'app_id' => 
  array (
    0 => 2,
    1 => 3,
  ),
  'fieldval' => 
  array (
    2 => 
    array (
      2 => 
      array (
        0 => 1,
      ),
    ),
    3 => 
    array (
      3 => 
      array (
        0 => 200,
        1 => 'day',
      ),
    ),
  ),
  'title' => 'new plan,',
  'feature_plan' => 3,
  'plan_type' => 'free',
  'price' => NULL,
  'sell_type' => 'us',
)

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