php獲取請求協議

function getHttpType()
{
	$http_type = "http";
	if(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on'){
		$http_type = "https";
	}
	elseif(isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')){
		$http_type = "https";
	}
    return $http_type;
}