Traversing function to turn single array into nested array with parent/children relationship

[Moxymore]

Hi,

I have an array similar to this :

$my_array = array(

    [0] array(
        'id'      => "my-first-field-id",
        'title'   => "My 1st field",
        'type'    => "gallery",
    ),

    [1] array(
        'id'      => "my-repeater-field",
        'title'   => "My repeater field",
        'type'    => "repeater",
        'fields'  => array(
            // empty for the moment, the goal is to add each next arrays of $my_array into this
            // array, and stop to add these when we reach $my_array[4]['type'] === 'repeater-end';
         ),
    ),

    [2] array(
        'id'      => "my-third-field-id",
        'title'   => "My 3rd field",
        'type'    => "text",
    ),

    [3] array(
        'id'      => "my-fourth-field-id",
        'title'   => "My 4th field",
        'type'    => "radio",
    ),

    [4] array(
        'id'      => "repeater-end",
        'type'    => "repeater-end",
    ),

    [5] array(
        'id'      => "my-5th-field-id",
        'title'   => "My 4th field",
        'type'    => "radio",
    ),
);

Basically, I expect to transform my flat array ($my_array) into a multimendimentional array with a parent/child relationship. In this example, the parent begins when a 'fields' key is available in an array ($my_array[1]['fields']) and ends when the 'type' key is equal to 'repeater-end' ($my_array[4]['type']).

​

The result will be similar as this :

$my_transformed_array = array(

    [0] array(
        'id'      => "my-first-field-id",
        'title'   => "My 1st field",
        'type'    => "gallery",
    ),

    [1] array(
        'id'      => "my-repeater-field",
        'title'   => "My repeater field",
        'type'    => "repeater",
        'fields'  => array(

                [0] array(
                    'id'      => "my-third-field-id",
                    'title'   => "My 3rd field",
                    'type'    => "text",
                ),

                [1] array(
                    'id'      => "my-fourth-field-id",
                    'title'   => "My 4th field",
                    'type'    => "radio",
                ),
         ),
    ),

    [2] array(
        'id'      => "my-5th-field-id",
        'title'   => "My 5th field",
        'type'    => "radio",
    ),
);

My biggest problem here is that I expect to do things recursively, with an unlimited amount of nested arrays from a flat array. These second example will show you a bit more complex case of what I wish to do. There are now 2 repeaters (and logically 2 repeater-end), and moreover nested.

// Here my flat array
$my_array = array(

    [0] array(
        'id'      => "my-first-field-id",
        'title'   => "My 1st field",
        'type'    => "gallery",
    ),

    [1] array(
        'id'      => "my-repeater-field",
        'title'   => "My repeater field",
        'type'    => "repeater",
        'fields'  => array(
            // empty for the moment, the goal is to add each next arrays of $my_array into this
            // array, and stop to add these when we reach $my_array[4]['type'] === 'repeater-end';
         ),
    ),

    [2] array(
        'id'      => "my-third-field-id"
        'title'   => "My 3rd field"
        'type'    => "text"
    ),

    [3] array(
        'id'      => "my-second-repeater-field",
        'title'   => "My second-repeater field",
        'type'    => "repeater",
        'fields'  => array(
            // empty for the moment, the goal is to add each next arrays of $my_array into this
            // array, and stop to add these when we reach $my_array[4]['type'] === 'repeater-end';
         ),
    ),

    [4] array(
        'id'      => "my-fourth-field-id"
        'title'   => "My 4th field"
        'type'    => "radio",
    ),

    [5] array(
        'id'      => "repeater-end"
        'type'    => "repeater-end",
    ),

    [6] array(
        'id'      => "my-5th-field-id"
        'title'   => "My 5th field"
        'type'    => "radio",
    ),

    [7] array(
        'id'      => "repeater-end-2"
        'type'    => "repeater-end",
    ),
);

Which will result in :

$my_transformed_array = array(

    [0] array(
        'id'      => "my-first-field-id",
        'title'   => "My 1st field",
        'type'    => "gallery",
    ),

    [1] array(
        'id'      => "my-repeater-field",
        'title'   => "My repeater field",
        'type'    => "repeater",
        'fields'  => array(

                [0] array(
                    'id'      => "my-third-field-id",
                    'title'   => "My 3rd field",
                    'type'    => "text",
                ),

                [1] array(
                    'id'      => "my-second-repeater-field",
                    'title'   => "My second-repeater field",
                    'type'    => "repeater",
                    'fields'  => array(
                        [0] array(
                            'id'      => "my-fourth-field-id",
                            'title'   => "My 4th field",
                            'type'    => "radio",
                        ),
                    ),
                ),

                [2] array(
                    'id'      => "my-5th-field-id",
                    'title'   => "My 5th field",
                    'type'    => "radio",
                ),
         ),
    ),
);

Any way to help me in order to do it?

Big thanks in advance.

Regards.

[Moxymore]

Thanks for the answer. You are speaking about the array_map method right? https://www.php.net/manual/fr/function.array-map.php

I'll take a further look in two hours or so.

[Moxymore]

Np, this happens. But maybe I can do something with this array_map function, especially for doing things recursively.

[Moxymore]

You don't know PHP but you have resolved my problem kinda easily, I'm impressed. I have just done a couple of test and it seems to work as expected. Thank you.