#static string http\Env::negotiateLanguage(array $supported[, array &$result])

Negotiate the client's preferred language.

NOTE:
The first element of $supported languages serves as a default if no language matches.

Params:#

• array $supported#
  List of supported content languages.
• Optional array &$result#
  Out parameter recording negotiation results.

Returns:#

• NULL, if negotiation fails.
• string, the negotiated language.