我刚刚在计算机上从 PHP 7.0 迁移到 PHP 7.1(当前版本的 WAMP 的全新/全新安装)，它似乎破坏了自定义 session 处理程序中的某些内容，该处理程序应该将 session 保存到数据库而不是使用文件系统。

自定义处理程序类是:

class db_session_handler implements 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:\wamp\www\universal_empires\test_log.txt");
            error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_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.',3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_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
                                , 0
                                , NOW()
                                , 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.',3,"C:\wamp\www\universal_empires\test_log.txt");
                error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
                error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_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.',3,"C:\wamp\www\universal_empires\test_log.txt");
                error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
                error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_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(), INTERVAL 30 MINUTE)
                        , 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.',3,"C:\wamp\www\universal_empires\test_log.txt");
                error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
                error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_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.',3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_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.',3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Query with error: $sql",3,"C:\wamp\www\universal_empires\test_log.txt");
            error_log(" Reason given: $e->getMessage()",3,"C:\wamp\www\universal_empires\test_log.txt");
            return false;
        }
    }
}

它由以下人员发起:

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!!!!');
}

通读 session_set_save_handler() 的手册页，我找不到任何可能解释我遇到的错误的内容:

Warning: session_start(): Failed to read session data: user (path: c:/wamp/tmp) in C:\wamp\www\universal_empires\libs\bootstrap.php on line 36

该文件中的第 36 行是对 session_start() 的调用。

谷歌搜索我能找到的唯一修复程序是特定于给定框架的。我需要知道的是导致 session_start() 失败的原因(从阅读关于 7.1 的更改 session_start() 返回 false 而不是在出现问题时尝试继续进行。

我的猜测是 7.1 中发生了一些变化，在 7.0 中可能允许继续进行，但在 7.1 中它对任何问题都更加严格，并且使 session_start() 返回 false。

我清空了数据库中的 session 表并检查了基于文件的 session 的存储位置。目前唯一的“基于文件的” session 文件是 PHPMyAdmin。

有谁知道它在 PHP 7.1 中违反了什么而在 PHP 7.0 中没有违反？

最佳答案

罪魁祸首已经找到。事实证明，如果不存在 session ，session_start() 不喜欢自定义 session 处理程序的读取方法返回 false。如果其他人遇到类似问题，如果您不存在 session ，则 read 方法需要返回一个空字符串，而不是 false 或 null。

解决方案位于 http://php.net/manual/en/function.session-start.php#120589我正在查看 session_set_save_handler() 的手册页，没想到解决方案实际上位于 session_start() 页面的评论部分。

我不知道为什么要更改 session_start() 方法期望从自定义 session 处理程序的读取方法中获取的内容

关于PHP 自定义 session 处理程序问题 (PHP 7.1)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48245296/