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   1 # static bool http\Env::setResponseHeader(string $header_name, [mixed $header_value = NULL[, int $response_code = 0[, bool $replace = true]]]
   2
   3 Set a response header, either replacing a prior set header, or appending the new header value, depending on $replace.
   4
   5 If no $header_value is specified, or $header_value is ```NULL```, then a previously set header with the same key will be deleted from the list.
   6
   7 If $response_code is not ```0```, the response status code is updated accordingly.
   8
   9 ## Parameters:
  10
  11 * ```string $header_name```, the name of the response header.
  12 * Optional ```mixed $header_value```, the header value.
  13 * Optional ```int $response_code```, any HTTP response status code to set.
  14 * Optional ```bool $replace```, whether to replace a previously set response header with the same name.
  15
  16 ## Returns:
  17
  18 * ```bool``` Success.