how to get the index of every array on multidimensional array with unknown depth in php

Question

array(2) { [0]=> array(2) { ["name"]=> string(16) "Daerah Pertanian" ["sub"]=> array(6) { [0]=> array(2) { ["name"]=> string(5) "Sawah" ["value"]=> string(3) "145" } [1]=> array(2) { ["name"]=> string(18) "Sawah Pasang Surut" ["value"]=> string(3) "455" } [2]=> array(2) { ["name"]=> string(6) "Ladang" ["value"]=> string(3) "678" } [3]=> array(2) { ["name"]=> string(10) "Perkebunan" ["value"]=> string(3) "688" } [4]=> array(2) { ["name"]=> string(19) "Perkebunan Campuran" ["value"]=> string(3) "966" } [5]=> array(2) { ["name"]=> string(16) "Tanaman Campuran" ["value"]=> string(3) "565" } } } [1]=> array(2) { ["name"]=> string(22) "Daerah Bukan Pertanian" ["sub"]=> array(2) { [0]=> array(2) { ["name"]=> string(18) "Hutan Lahan Kering" ["sub"]=> array(2) { [0]=> array(2) { ["name"]=> string(25) "Hutan Lahan Kering Primer" ["value"]=> string(3) "566" } [1]=> array(2) { ["name"]=> string(27) "Hutan Lahan Kering Sekunder" ["value"]=> string(3) "255" } } } [1]=> array(2) { ["name"]=> string(17) "Hutan Lahan Basah" ["sub"]=> array(2) { [0]=> array(1) { ["name"]=> string(24) "Hutan Lahan Basah Primer" } [1]=> array(1) { ["name"]=> string(26) "Hutan Lahan Basah Sekunder" } } } } } }

I have an array like I mention above, so I want to print out every "name" key including the index (number) of it's array parent,

for example when I print out "Tanaman Campuran" so all index parent is (0)(5) and when I print "Hutan Lahan Basah Sekunder" the index parent is (1)(1)(1)

how can I achieve it?

here is some recursive function that I've tried

$GLOBALS['all'] = '';
    function printout($arr){
        foreach ($arr as $ia=>$a){
            if(is_array($a)){
                foreach ($a as $ib=>$b){
                    if(is_array($b)){
                        printout($b);
                    }
                    else{
                        if ($ib == 'name') {
                            $GLOBALS['all'] .= $ia;
                            echo '<tr>';
                            echo '<td>' . $b . ' (' . $ia . ')</td>';
                            echo '</tr>';
                            $GLOBALS['all'] = '';
                        }
                    }
                }
            }
        }
    }

*sorry for my bad explanation, I hope you guys can understand it

I've edit my question, and adding my sample code, please checkout — Boy Panjaitan
– Boy Panjaitan, Commented Dec 8, 2018 at 13:17

Jeto · Accepted Answer · 2018-12-08 14:00:57Z

1

You could use the following function:

function search(array $array, $name)
{
  foreach ($array as $key => $entry) {
    if ($entry['name'] === $name) {
      return [$key];
    }
    if (isset($entry['sub']) && $found_keys = search($entry['sub'], $name)) {
      return array_merge([$key], $found_keys);
    }
  }
  return null;
}

It returns:

if the value was directly found, an array of one containing the associated index,
if it wasn't but was found in any descendant item, an array merging its index with the indices of said descendant,
null if it wasn't found in that part of the tree.

Note: if a given name is present several times, it will only find the first occurrence.

Demo: https://3v4l.org/1hGr1

edited Dec 8, 2018 at 14:00

answered Dec 8, 2018 at 13:55

Jeto

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