$redis['redis'] = array(
    'host' => '192.168.41.33',
    'auth' => '8GLjx3tdi',
    'port' => 6379,
    'db' => 2
);
redisConn($redis['redis']);
function redisConn($c)
{
    $redis = new Redis();
    $result = $redis->connect($c['host'], $c['port']);
    if (empty($result)) {
        die("connect redis error");
    }
    if (!empty($c['auth'])) {
        $redis->auth($c['auth']); // 设置密码
    }
    $redis->select($c['db']);
    return $redis;
}