1 # http\Message http\Message::setHeader(string $header[, mixed $value = NULL])
4 See http\Message::getHeader() and http\Message::addHeader().
7 > Prior to v2.5.6/v3.1.0 headers with the same name were merged into a single
8 > header with values concatenated by comma.
14 * Optional mixed $value = NULL
15 The header's value. Removes the header if NULL.
24 * Multiple headers with the same name are kept separate instead of merged together.