private function createHeader($parameters)
	{
		$header = 'OAuth ';

		foreach ($parameters as $key => $value)
		{
			if (!strcmp($header, 'OAuth '))
			{
				$header .= $key . '="' . $this->safeEncode($value) . '"';
			}
			else
			{
				$header .= ', ' . $key . '="' . $value . '"';
			}
		}

		return $header;
	}