CTwitterInterface::GetSignatureString

protected function GetSignatureString($arParams, $url)
{
	$typeRequest = "POST";
	if($url === self::API_URL || $url === self::SEARCH_URL || $url == self::FRIENDS_URL)
		$typeRequest = "GET";
	if(array_key_exists('oauth_signature', $arParams))
		unset($arParams['oauth_signature']);

	return implode('&',
		$this->urlencode(
			array(
				$typeRequest,
				$url,
				$this->BuildQuery($arParams),
			)
		)
	);
}