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   1 # static string http\Env::negotiateLanguage(array $supported[, array &$result])
   2
   3 Negotiate the client's preferred language.
   4
   5 > ***NOTE:***
   6 > The first element of $supported languages serves as a default if no language matches.
   7
   8 ## Params:
   9
  10 * array $supported
  11   List of supported content languages.
  12 * Optional array &$result
  13   Out parameter recording negotiation results.
  14
  15 ## Returns:
  16
  17 * NULL, if negotiation fails.
  18 * string, the negotiated language.