/**
* Given a host/port combination separated by a colon, set it as
* the redis server that Resque will talk to.
*
* @param mixed $server Host/port combination separated by a colon, or
* a nested array of servers with host/port pairs.
* @param int $database
*/
public static function setBackend($server, $database = 0, $namespace = 'resque')
{
self::$redisServer = $server;
self::$redisDatabase = $database;
self::$redis = null;
self::$namespace = $namespace;
}