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