array_map for multidimensional array

multidimentionalArrayMap.php

function multidimentional_array_map( $function, $arr ){
  	$result = array();
  	foreach ($arr as $key => $val){
      	$result[$key] = (is_array($val) ? multidimentional_array_map($function, $val) : $function($val));
  	}
  	return $result;
}