private function internalSet(array &$array, $key, $value)
{
if (is_null($key)) {
return $array = $value;
}
$keys = explode('.', $key);
while (count($keys) > 1) {
$key = array_shift($keys);
if (!isset($array[$key]) || !is_array($array[$key])) {
$array[$key] = [];
}
$array =& $array[$key];
}
$array[array_shift($keys)] = $value;
return $array;
}