PHP Need to recursively reverse an array

Question

I need to recursively reverse a HUGE array that has many levels of sub arrays, and I need to preserve all of the keys (which some are int keys, and some are string keys), can so

Answer 1

Reversing a HUGE php array in situ (but not recursively):

function arrayReverse(&$arr){
  if (!is_array($arr) || empty($arr)) {
    return;
  }
  $rev = array();
  while ( false !== ( $val = end($arr) ) ){
    $rev[ key($arr) ] = $val;
    unset( $arr[ key($arr) ] );
  }
  $arr = $rev;
}
//usage
$test = array(5, 'c'=>100, 10, 15, 20);
arrayReverse($test);
var_export($test);
// result: array ( 3 => 20, 2 => 15, 1 => 10, 'c' => 100, 0 => 5, )