Replace values with their keys in multidimensional array

Question

I need to replace all values in a multidimensional array by their respective key, but only if the value is not an array.

From:

array(
    'key1' => array(
        'key2' => array(
            'key3' => 'val'
        )
    )
);

To:

array(
    'key1' => array(
        'key2' => array(
            'key3'
        )
    )
);

Does anyone know a way to do this nicely?

Waleed Khan · Accepted Answer · 2013-08-24 19:57:21Z

1

This seems to do more or less what you want (fiddle):

<?php
function convert($arr) {
    $ret = array();
    foreach ($arr as $key => $value) {
        if (is_array($value)) {
            $ret[$key] = convert($value);
        } else {
            $ret[] = $key;
        }
    }
    return $ret;
}
$test = array(
    'key1' => array(
        'key2' => array(
            'key3' => 'val'
        )
    )
);
var_dump(convert($test));

Output:

array(1) {
  ["key1"]=>
  array(1) {
    ["key2"]=>
    array(1) {
      [0]=>
      string(4) "key3"
    }
  }
}

answered Aug 24, 2013 at 19:57

Waleed Khan

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2 Comments

Sergiu Paraschiv Over a year ago

I think he needs $ret[] = $key;

Bram Gerritsen Over a year ago

Thanks for you answer. I had to make one modification, because I need the key of the last item as the value. see ideone.com/JCoR0f

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