Convert multidimensional array into single array

Question

I have an array which is multidimensional for no reason

/* This is how my array is currently */
Array
(
[0] => Array
    (
        [0] => Array
                


        

Answer 1

I've written a complement to the accepted answer. In case someone, like myself need a prefixed version of the keys, this can be helpful.

Array
(
    [root] => Array
        (
            [url] => http://localhost/misc/markia
        )

)

Array
(
    [root.url] => http://localhost/misc/markia
)

 $value) {
    if (is_array($value)) {
      $result = array_merge($result, flattenOptions($value, $key));
    }
    else {
      $result[$old . '.' . $key] = $value;
    }
  }
  return $result;
}