search
HomeBackend DevelopmentPHP TutorialPHP独立Session数据库存储操作类分享_php实例

直接上代码:

复制代码 代码如下:

class DbSession
{

    const TYPE_INT = 1;
    const TYPE_STR = 2;

    /**
     * Database configration
     *
     * @var array
     */
    private $_config = array(
            ‘host' => '127.0.0.1′,
            ‘port' => 3306,
            ‘username' => ‘root',
            ‘password' => ‘root',
            ‘dbname' => ‘db_mylab',
        ‘tablename' => ‘t_sessions',
        ‘cookie_prefix' => ‘mylab_',
        ‘cookiepath' => ‘/',
        ‘cookiedomain' => ”,
        ‘cookie_timeout' => 900
    );

    /**
     * Table fields type array
     *
     * @var array
     */
    private  $_db_fields = array(
        ‘crc32sid'      => self::TYPE_INT,
                ‘sessionhash'   => self::TYPE_STR,
                ‘idhash'        => self::TYPE_STR,
                ‘userid'        => self::TYPE_INT,
                ‘ipaddress'     => self::TYPE_STR,
                ‘lastactivity'  => self::TYPE_STR,
                ‘location'      => self::TYPE_STR,
        ‘loggedin'      => self::TYPE_INT,
        ‘heartbeat'     => self::TYPE_STR
        );

        /**
         * db obj
         *
         * @var mysqli object
         */
    private $_mysqli = null;

    /**
     * Weather the session was created or existed previously
     *
     * @var bool
     */
    private $_created = false;

    /**
     * Array of changes.
     *
     * @var array
     */
    private $_changes = array();

    /**
     * @var bool
     */

    private $_db_inited = false;

    /**
     * session host
     *
     * @var string
     */
    private $_session_host = ”;

    /**
     * session idhash
     *
     * @var string
     */
    private $_session_idhash = ”;

    private $_dbsessionhash = ”;

    private $_vars = array();

        public function __construct()
        {
                $this->_dbsessionhash = addslashes($this->get_cookie(‘sessionhash'));

            $this->_session_host = substr($_SERVER[‘REMOTE_ADDR'], 0, 15);

            #This should *never* change during a session
            $this->_session_idhash = md5($_SERVER[‘HTTP_USER_AGENT'] . self::fetch_substr_ip(self::fetch_alt_ip()) );

            $this->_init_config();
            $this->init_db();

            $gotsession = false;

            if ($this->_dbsessionhash)
            {
                $sql = ‘
                        SELECT *
                        FROM ‘ . $this->_config[‘tablename'] . ‘
                        WHERE   crc32sid = ‘ . sprintf(‘%u', crc32($this->_dbsessionhash)) . ‘
                            AND sessionhash = '‘ . $this->_dbsessionhash . ‘'
                                AND idhash = '‘ . $this->_session_idhash . ‘'
                        AND heartbeat > '‘ . date(‘Y-m-d H:i:s' ,TIMENOW – $this->_config[‘cookie_timeout']) . ‘'‘;
                    //echo $sql;exit;
                $result = $this->_mysqli->query($sql);
                $session = $result->fetch_array(MYSQLI_ASSOC);

                if ($session AND ($this->fetch_substr_ip($session[‘ipaddress']) == $this->fetch_substr_ip($this->_session_host)))
                {
                        $gotsession = true;
                        $this->_vars = $session;
                        $this->_created = false;
                }
            }

            if ($gotsession == false)
            {
                $this->_vars = $this->fetch_session();
                $this->_created = true;
                $gotsession = true;
            }

            if ($this->_created == false)
            {
            $this->set(‘lastactivity', date(‘Y-m-d H:i:s', TIMENOW));
            $this->set(‘location', $_SERVER[‘REQUEST_URI']);
            }

        }

    /**
     * Builds an array that can be used to build a query to insert/update the session
     *
     * @return    array    Array of column name => prepared value
     */
    private function _build_query_array()
    {
        $return = array();
        foreach ($this->_db_fields AS $fieldname => $cleantype)
        {
            switch ($cleantype)
            {
                case self::TYPE_INT:
                    $cleaned = is_numeric($this->_vars["$fieldname"]) ? $this->_vars["$fieldname"] : intval($this->_vars["$fieldname"]);
                    break;
                case self::TYPE_STR:
                default:
                    $cleaned = "'" . addslashes($this->_vars["$fieldname"]) . "'";
            }
            $return["$fieldname"] = $cleaned;
        }

        return $return;
    }

    /**
     * Sets a session variable and updates the change list.
     *
     * @param    string    Name of session variable to update
     * @param    string    Value to update it with
     */
    public function set($key, $value)
    {
        if ($this->_vars["$key"] != $value)
        {
            $this->_vars["$key"] = $value;
            $this->_changes["$key"] = true;
        }
    }

    public function get($key)
    {
        return $this->_vars["$key"];
    }

        public function unsetchangedvar($var)
    {
        if (isset($this->_changes["$var"]))
        {
                unset($this->_changes["$var"]);
        }
    }

    /**
     * Fetches a valid sessionhash value, not necessarily the one tied to this session.
     *
     * @return    string    32-character sessionhash
     */
    static function fetch_sessionhash()
    {
        return hash(‘md5′ , TIMENOW . rand(1, 100000) . uniqid() );
    }

        private function _init_config()
        {
                $registry = Zend_Registry::getInstance();
                $config = $registry->get(‘config');
                $this->_config[‘host'] = $config->database->params->host;
        $this->_config[‘port'] = $config->database->params->port;
        $this->_config[‘username'] = $config->database->params->username;
        $this->_config[‘password'] = $config->database->params->password;
        $this->_config[‘dbname'] = $config->database->params->dbname;
        $this->_config[‘tablename'] = $config->database->session->tablename;

        }

        /**
         * initialize database connection
         */
        public function init_db()
        {
            if ($this->_db_inited)
            {
                return true;
            }

            //mysqli_report(MYSQLI_REPORT_OFF);

            $this->_mysqli = new mysqli(
                $this->_config[‘host'],
                $this->_config[‘username'],
                $this->_config[‘password'],
                $this->_config[‘dbname'],
                $this->_config[‘port']
            );

            /* check connection */
                if (mysqli_connect_errno())
                {

                    // printf("Connect failed: %sn", mysqli_connect_error());
                    // echo ‘in ‘, __FILE__, ‘ on line ‘, __LINE__;
                    echo "{ success: false, errors: { reason: ‘ Connect failed: " . addslashes( mysqli_connect_error() ) . "' }}";
                    exit();

                }

            $this->_mysqli->query(‘set names latin1′);
            $this->_db_inited = true;

            return true;
        }

    /**
         * Fetches an alternate IP address of the current visitor, attempting to detect proxies etc.
         *
         * @return      string
         */
        static function fetch_alt_ip()
        {
                $alt_ip = $_SERVER[‘REMOTE_ADDR'];

                if (isset($_SERVER[‘HTTP_CLIENT_IP']))
                {
                        $alt_ip = $_SERVER[‘HTTP_CLIENT_IP'];
                }
                else if (isset($_SERVER[‘HTTP_FROM']))
                {
                        $alt_ip = $_SERVER[‘HTTP_FROM'];
                }

                return $alt_ip;
        }

    /**
     * Returns the IP address with the specified number of octets removed
     *
     * @param    string    IP address
     *
     * @return    string    truncated IP address
     */
    static function fetch_substr_ip($ip, $length = null)
    {
        return implode(‘.', array_slice(explode(‘.', $ip), 0, 4 – $length));
    }

    /**
     * Fetches a default session. Used when creating a new session.
     *
     * @param    integer    User ID the session should be for
     *
     * @return    array    Array of session variables
     */
    public function fetch_session($userid = 0)
    {
        $sessionhash = self::fetch_sessionhash();

        $this->set_cookie(‘sessionhash', $sessionhash);

        return array(
            ‘crc32sid'      => sprintf(‘%u', crc32($sessionhash)),
            ‘sessionhash'   => $sessionhash,
            ‘idhash'        => $this->_session_idhash,
            ‘userid'        => $userid,
            ‘ipaddress'     => $this->_session_host,
            ‘lastactivity'  => date(‘Y-m-d H:i:s', TIMENOW),
            ‘location'      => $_SERVER[‘REQUEST_URI'],
            ‘loggedin'      => $userid ? 1 : 0,
            ‘heartbeat'     => date(‘Y-m-d H:i:s', TIMENOW)
        );
    }

    public function get_cookie($cookiename)
    {
        $full_cookiename = $this->_config[‘cookie_prefix'] . $cookiename;

        if (isset($_COOKIE[$full_cookiename]))
        {
            return $_COOKIE[$full_cookiename];
        }
        else
        {
            return  false;
        }
    }

    public function set_cookie($name, $value = ”, $permanent = 1, $allowsecure = true)
    {

        if ($permanent)
        {
            $expire = TIMENOW + 60 * 60 * 24 * 365;
        }
        else
        {
            $expire = 0;
        }

        if ($_SERVER[‘SERVER_PORT'] == '443′)
        {
            // we're using SSL
            $secure = 1;
        }
        else
        {
            $secure = 0;
        }

        // check for SSL
        $secure = ((REQ_PROTOCOL === ‘https' AND $allowsecure) ? true : false);

        $name = $this->_config[‘cookie_prefix'] . $name;
        $filename = ‘N/A';
        $linenum = 0;

        if (!headers_sent($filename, $linenum))
        { // consider showing an error message if there not sent using above variables?
            if ($value == ” AND strlen($this->_config[‘cookiepath']) > 1 AND strpos($this->_config[‘cookiepath'], ‘/') !== false)
            {
                // this will attempt to unset the cookie at each directory up the path.
                // ie, cookiepath = /test/abc/. These will be unset: /, /test, /test/, /test/abc, /test/abc/
                // This should hopefully prevent cookie conflicts when the cookie path is changed.
                $dirarray = explode(‘/', preg_replace(‘#/+$#', ”, $this->_config[‘cookiepath']));
                $alldirs = ”;
                foreach ($dirarray AS $thisdir)
                {
                    $alldirs .= "$thisdir";
                    if (!empty($thisdir))
                    { // try unsetting without the / at the end
                        setcookie($name, $value, $expire, $alldirs, $this->_config[‘cookiedomain'], $secure);
                    }
                    $alldirs .= "/";
                    setcookie($name, $value, $expire, $alldirs, $this->_config[‘cookiedomain'], $secure);
                }
            }
            else
            {
                setcookie($name, $value, $expire, $this->_config[‘cookiepath'], $this->_config[‘cookiedomain'], $secure);
            }
        }
        else if (!DEBUG)
        {
            echo "can't set cookies";
        }
    }

        private function _save()
        {
            $cleaned = $this->_build_query_array();

            if ($this->_created)
            {
                //var_dump($cleaned);
                # insert query
                $this->_mysqli->query(‘
                        INSERT IGNORE INTO ‘ . $this->_config[‘tablename'] . ‘
                        (‘ . implode(‘,', array_keys($cleaned)) . ‘)
                    VALUES
                        (‘ . implode(‘,', $cleaned). ‘)
                ‘);
            }
            else
            {
                # update query
                $update = array();

            foreach ($cleaned AS $key => $value)
            {
                if (!empty($this->_changes["$key"]))
                {
                    $update[] = "$key = $value";
                }
            }

            if (sizeof($update) > 0)
            {
                $sql = ‘UPDATE ‘ . $this->_config[‘tablename'] . ‘
                        SET ‘ . implode(‘, ‘, $update) . ‘
                        WHERE crc32sid = ‘ . sprintf(‘%u', crc32($this->_dbsessionhash)) . ‘
                            AND sessionhash = '‘ . $this->_dbsessionhash . ‘'‘;
                //echo $sql;
                $this->_mysqli->query($sql);
            }
            }
        }

        public function getOnlineUserNum()
        {
                $sql = ‘
                        SELECT count(*) as cnt
                        FROM ‘ . $this->_config[‘tablename'] . ‘
                        WHERE loggedin = 1
                          AND heartbeat > '‘ . date(‘Y-m-d H:i:s' ,TIMENOW – $this->_config[‘cookie_timeout']) . ‘'‘;

            $result = $this->_mysqli->query($sql);
            $row = $result->fetch_array(MYSQLI_ASSOC);
                return $row[‘cnt'];
        }

        private function _gc()
        {
                $rand_num = rand(); # randow integer between 0 and getrandmax()
                if ($rand_num                 {
                        $sql = ‘DELETE FROM ‘ . $this->_config[‘tablename'] . ‘
                                WHERE heartbeat _config[‘cookie_timeout']) . ‘'‘;

                        $this->_mysqli->query($sql);
                }
        }

        public function __destruct()
        {
            $this->_save();
            $this->_gc();
            $this->_mysqli->close();
        }

}

 

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
php怎么把负数转为正整数php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PM

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

php怎么实现几秒后执行一个函数php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php怎么除以100保留两位小数php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PM

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php怎么根据年月日判断是一年的第几天php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有没有下标php字符串有没有下标Apr 24, 2022 am 11:49 AM

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php怎么读取字符串后几个字符php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php怎么替换nbsp空格符php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\&nbsp\;||\xc2\xa0)/","其他字符",$str)”语句。

php怎么判断有没有小数点php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PM

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

Repo: How To Revive Teammates
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)