PHP Insert array into multidimensional array by using an array value

Question

I got arrays like this build upon data from a database representing single pages of a cms:

    $page =

            Array
        (
            [title] => mein produkt
            [NavID] => 200
            [parents] => Array
                (
                    [0] => 0
                    [1] => 3
                    [2] => 200
                )

        )

And I need to put that into an other multidimensional array like this representing the sitemap:

$map =

    Array
    (
        [NavID] => 0
        [0] => Array
            (
                [childs] => Array
                    (
                        [1] => Array
                            (
                                [title] => home
                                [NavID] => 1
                            )

                        [2] => Array
                            (
                                [title] => impressum
                                [NavID] => 2
                                [childs] => Array
                                    (
                                        [100] => Array
                                            (
                                                [title] => startseite
                                                [NavID] => 100
                                                [parents] => Array
                                                    (
                                                        [0] => 0
                                                        [1] => 2
                                                        [2] => 100
                                                    )

                                            )

                                    )

                            )

                        [3] => Array
                            (
                                [title] => produkte
                                [NavID] => 3
                            )

                    )

            )

    )

As you see, I got the structure of the array as the array value on parents.

So what I would do by hand is putting this like:

$map[0]['childs'][3]['childs'][200] = $page;

Put how can I select the multidimensional array with my array value $page['parents']?

Thanks for helping me out.

Use [array_keys()](http://php.net/array_keys) to access the inter arrays keys more at — Be0wulf, Aug 28 '14 at 09:37
read this like: http://stackoverflow.com/questions/1019076/how-to-search-by-key-value-in-a-multidimensional-array-in-php — Punitha Subramani, Aug 28 '14 at 09:43

Clément Malet · Accepted Answer · 2014-08-28T11:24:58.340

1

You can directly use $page['parents'][KEY] as keys when accessing $map values that way :

$map[$page['parents'][0]]['childs'][$page['parents'][1]]['childs'][$page['parents'][2]] = $page;

As your tree grows, I'd really suggest to shorten it with a direct variable :

$par = $page['parents'];
$map[$par[0]]['childs'][$par[1]]['childs'][$par[2]] = $page;

To dynamically go to the correct node, just loop over your parents using references :

$tmp = &$map;
$first = true;
foreach ($page['parents'] as $parent) {
  if ($first) { // Quick workaround to skip the first node without 'childs' key
    $tmp = &$tmp[$parent];
    $first = false;
    continue;
  }
  $tmp = &$tmp['childs'][$parent];
}
$tmp = $page;

edited Aug 28 '14 at 11:24

answered Aug 28 '14 at 09:37

Clément Malet

5,062
3
29
48

Thank you for the hint. But I don't know now deep the page is, so maybe there are six parent elements. I know I can use array_count to determine how many I got. But then again, how can I put this in one line like your answer? – da.eXecutoR Aug 28 '14 at 09:40
What I need is to create this pointer "$map[$par[0]]['childs'][$par[1]]['childs'][$par[2]]" programmatically. – da.eXecutoR Aug 28 '14 at 09:45
@da.eXecutoR Updated my answer to use references / pointers as you want. – Clément Malet Aug 28 '14 at 09:51
I had to make a small mod to get it working: $tmp = &$map; $first = true; foreach ($page['parents'] as $parent) { if ($first) { // Quick workaround to skip the first node without childs $first = false; $tmp = &$tmp[$parent]; continue; } $tmp = &$tmp['childs'][$parent]; } $tmp = $page; Thank you very much mate! Made my day! – da.eXecutoR Aug 28 '14 at 09:57

PHP Insert array into multidimensional array by using an array value

1 Answers1