PHP自定义会话处理程序问题(PHP 7.1)

自定义处理程序类是：
????

class db_session_handler实现SessionHandlerInterface {

public function __construct($db) {
    $this->db = $db;
}

public function open($save_path,$session_name) {
    $this->db;
    return true;
}

public function close() {
    unset($this->db);
    return true;
}

public function read($session_id) {

    if (!isset($session_id)) {
        $session_id='';
    }

    try {
        $sql="
            SELECT
                sess_data
            FROM
                ue_user_session
            WHERE
                sess_id = :sess_id
        ";
        $stmt = $this->db->prepare($sql);
        $stmt->bindParam(':sess_id',$session_id);
        $stmt->execute();
        $res = $stmt->fetchAll(PDO::FETCH_ASSOC);
        if (count($res) <> 1 ) {
            return false;
        } else {
            return $res[0]['sess_data'];
        }
    }
    catch (PDOException $e) {
        error_log('Error reading the session data table in the session reading method.',3,"C:wampwwwuniversal_empirestest_log.txt");
        error_log(" Query with error: $sql","C:wampwwwuniversal_empirestest_log.txt");
        error_log(" Reason given: $e->getMessage()","C:wampwwwuniversal_empirestest_log.txt");
        return false;
    }
}

public function write($session_id,$session_data) {

    try {
        $sql="
            SELECT
                sess_data
            FROM
                ue_user_session
            WHERE
                sess_id = :sess_id
        ";
        $stmt = $this->db->prepare($sql);
        $stmt->bindParam(':sess_id',$session_id);
        $stmt->execute();
        $res = $stmt->fetchAll(PDO::FETCH_ASSOC);

    }
    catch (PDOException $e) {
        error_log('Error reading the session data table in the session reading method.',"C:wampwwwuniversal_empirestest_log.txt");
        return false;
    }
    $ip = get_ip();
    if (isset($_SESSION['user_id'])) {
        $user_id = (int) $_SESSION['user_id'];
    } else {
        $user_id= (int) 0;
    }       
    if (empty($res)) {

        if (!isset($_SERVER['REDIRECT_URL'])) {
            $location = 'Unknown';
        } else {
            $location = $_SERVER['REDIRECT_URL'];
        }

        try {
            if (count($res) === 0) {
                $sql="
                    INSERT INTO
                        ue_user_session
                    (
                          sess_id,user,start,last_activity,location,ip,user_agent,user_host,user_language,expires,sess_data
                    )
                    VALUES
                        (
                              :sess_id,NOW(),:location,:ip,:user_agent,:user_host,:user_lang,DATE_ADD(NOW(),INTERVAL 30 MINUTE),:sess_data                        
                        )               
                ";

                $stmt = $this->db->prepare($sql);
                $stmt->bindParam(':sess_id',$session_id);
                $stmt->bindParam(':location',$location);
                $stmt->bindParam(':ip',$ip);
                $stmt->bindParam(':user_agent',$_SERVER['HTTP_USER_AGENT']);
                $stmt->bindParam(':user_host',$_SERVER['REMOTE_HOST']);
                $stmt->bindParam(':user_lang',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
                $stmt->bindParam(':sess_data',$session_data);
                $stmt->execute();
                return true;
            }
        }
        catch (PDOException $e) {
            error_log('Error reading the session data table in the session reading method.',"C:wampwwwuniversal_empirestest_log.txt");
            error_log(" Query with error: $sql","C:wampwwwuniversal_empirestest_log.txt");
            error_log(" Reason given: $e->getMessage()","C:wampwwwuniversal_empirestest_log.txt");
            return false;
        }
    } else {

        try {
            $sql="
                UPDATE
                    ue_user
                SET
                    last_activity = NOW()
                WHERE
                    id =  :user_id
            ";
            $stmt = $this->db->prepare($sql);
            $stmt->bindParam(':user_id',$user_id);
            $stmt->execute();
        }
        catch (PDOException $e) {
            error_log('Error reading the session data table in the session reading method.',"C:wampwwwuniversal_empirestest_log.txt");
            return false;
        }


        if (!isset($_SERVER['REDIRECT_URL'])) {
            $location = 'Unknown';
        } else {
            $location = $_SERVER['REDIRECT_URL'];
        }
        try {

            $sql="
                UPDATE
                    ue_user_session
                SET
                      last_activity = NOW(),expires = DATE_ADD(NOW(),location = :location,ip = :ip,user_agent = :user_agent,user_host = :user_host,user_language = :user_lang,sess_data = :sess_data,user = :user_id
                WHERE
                    sess_id = :sess_id              
            ";

            $stmt = $this->db->prepare($sql);
            $stmt->bindParam(':location',$location);
            $stmt->bindParam(':ip',$ip);
            $stmt->bindParam(':user_agent',$_SERVER['HTTP_USER_AGENT']);
            $stmt->bindParam(':user_host',$_SERVER['REMOTE_HOST']);
            $stmt->bindParam(':user_lang',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
            $stmt->bindParam(':sess_data',$session_data);
            $stmt->bindParam(':user_id',$user_id);
            $stmt->bindParam(':sess_id',$session_id);
            $stmt->execute();
            return true;
            }
        catch (PDOException $e) {
            error_log('Error reading the session data table in the session reading method.',"C:wampwwwuniversal_empirestest_log.txt");
            return false;
        }
    }
    $this->gc();
}

public function destroy($session_id) {
    try {
        $sql="
            DELETE FROM
                ue_user_session
            WHERE
                sess_id = :sess_id
        ";
        $stmt = $this->db->prepare($sql);
        $stmt->bindParam(':sess_id',$session_id);
        $stmt->execute();
        return true;
    }
    catch (PDOException $e) {
        error_log('Error reading the session data table in the session reading method.',"C:wampwwwuniversal_empirestest_log.txt");
        return false;
    }
}

public function gc($max_lifetime) {
    try {
        $sql="
            DELETE FROM
                ue_user_session
            WHERE
                NOW() > expires
        ";
        $stmt = $this->db->prepare($sql);
        $stmt->execute();
        return true;
    }
    catch (PDOException $e) {
        error_log('Error reading the session data table in the session reading method.',"C:wampwwwuniversal_empirestest_log.txt");
        return false;
    }
}

}
？>

它的初衷是：
????????????函数ini_set( ‘session.use_only_cookies’,1);

$db_session_handler = new db_session_handler($db);
    session_set_save_handler($db_session_handler,true);

    if (session_start() === false ) {
        die('The Session Handler Is Broken!!!!');
    }

通过session_set_save_handler()的手册页阅读我无法发现任何可能解释我得到的错误的内容：

Warning: session_start(): Failed to read session data: user (path: c:/wamp/tmp) in C:wampwwwuniversal_empireslibsbootstrap.php on line 36

该文件中的第36行是对session_start()的调用.

围绕我能找到的唯一修复的Gooogling特定于给定的框架.我需要知道的是导致session_start()失败的原因(从读取有关7.1 session_start()的更改返回false,而不是在某些事情不对时尝试进行操作.

我的猜测是7.1中的某些内容发生了变化,其中7.0可能允许继续进行,但在7.1中它更严格,无论问题是什么,并使session_start()返回false.

我已经清空了数据库中的会话表,并检查了存储基于文件的会话的位置.唯一存在的“基于文件”的会话文件是PHPMyAdmin.

有谁知道它在PHP 7.1中的犯规是什么,它不会在PHP 7.0中犯规？