public static function normalizeKey($key, $prefix = null)
{
$key = Driver::normalizeKey($key);
$key = str_replace(['\\', '/'], DIRECTORY_SEPARATOR, $key);
$key = rtrim($key, DIRECTORY_SEPARATOR);
$key = explode(DIRECTORY_SEPARATOR, $key);
$key = array_map(function ($value) {
return filter_var($value, FILTER_SANITIZE_STRING) === $value ? $value : md5($value);
}, $key);
$key = implode($key, DIRECTORY_SEPARATOR);
return $key;
}
