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function connect_redis(){
    try{
        $redis = new \Redis();
        $redis->connect('127.0.0.1', 6379, 2);// 127.0.0.1 连接的IP，6379 连接的端口，2 连接的超时时长，单位：秒
        $redis->ping();
        return $redis;
    } catch (\Exception $e){
        header('Content-Type: application/json; charset=utf-8');
        die('{"error": "数据库连接错误，请检查数据库服务是否启动"}');
    }
}