$encoding_list * * @return null|Encoding The string encoding or null if unable to detect encoding. * * @pure */ function detect_encoding(string $string, ?array $encoding_list = null): ?Encoding { if (null !== $encoding_list) { $encoding_list = array_map( static fn(Encoding $encoding): string => $encoding->value, $encoding_list ); } $encoding = mb_detect_encoding($string, $encoding_list, true) ?: null; return null === $encoding ? $encoding : Encoding::from($encoding); }