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