Helper for drupal_rewrite_settings().
Makes the new settings global.
array|NULL $ref: A reference to a nested index in $GLOBALS.
array|object $variable: The nested value of the setting being copied.
function _drupal_rewrite_settings_global(&$ref, $variable) {
  if (is_object($variable)) {
    $ref = $variable->value;
  }
  else {
    foreach ($variable as $k => $v) {
      _drupal_rewrite_settings_global($ref[$k], $v);
    }
  }
}