public static function doMergeRecursive(&$reference, $append)
{
foreach ($append as $key => $value) {
if (isset($reference[$key])) {
if (is_array($reference[$key]) && is_array($value)) {
$reference[$key] = \UArray::mergeRecursive($reference[$key], $value);
} else {
if (is_numeric($key)) {
$reference[] = $value;
} else {
$reference[$key] = $value;
}
}
} else {
$reference[$key] = $value;
}
}
}
