public header ( string | array | null $header = null, string | array | null $value = null ) : array | ||
$header | string | array | null | An array of header strings or a single header string - an associative array of "header name" => "header value" is also accepted - an array of string headers is also accepted |
$value | string | array | null | The header value(s) |
return | array | List of headers to be sent |