php基于session实现数据库交互的类实例
发布:smiling 来源: PHP粉丝网 添加日期:2021-06-15 17:21:17 浏览: 评论:0
这篇文章主要介绍了php基于session实现数据库交互的类,实例分析了php结合session操作数据库的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下,本文实例讲述了php基于session实现数据库交互的类,分享给大家供大家参考,具体如下:
- <?php
- /**
- * session 数据库存储类
- */
- class Session {
- private static $session_id = 0;
- private static $session_data = array();
- private static $is_update = FALSE;
- private static $is_del = FALSE;
- private static $is_gc = FALSE;
- private static $dbo = NULL; //数据库连接句柄
- private static $gc_max_time = 1440;
- private static $table = 'sessions';
- private static $pre_key = 'weige';//session 密钥
- //捆绑使用哈
- private static $gc_rate_de = 100;//代表分母
- private static $gc_rate_co = 20;//代表分子
- private static $path = '/';//保存路径
- private static $domain = null; //域
- private static $secure = false;//默认
- private static $httponly = false;//默认
- /**
- * 获取数据库句柄 私有
- */
- private static function open()
- {
- if (!self::$dbo)
- {
- self::$dbo = Db::factory();
- }
- return TRUE;
- }
- /**
- * 设置
- * */
- public static function set($key, $val=NULL)
- {
- self::open();
- $data = self::read();
- if ($data === FALSE)
- {
- $data = array();
- }
- if (!$val && is_array($key))
- {
- $data = $key;
- }
- else if ($val && is_string($key))
- {
- $data[$key] = $val;
- }
- self::write($data);
- self::close();
- }
- /**
- *获取值
- *
- */
- public static function get($key=NULL) {
- self::open();
- self::$session_data = self::read();
- $ret = '';
- if (!$key) {
- $ret = self::$session_data;
- } else if(is_array(self::$session_data) && isset(self::$session_data[$key])) {
- $ret = self::$session_data[$key];
- }
- self::update();
- self::close();
- return $ret;
- }
- /**
- * 删除或者重置
- * */
- public static function del($key)
- {
- if (!self::$is_del)
- {
- self::open();
- $val = self::read();
- if (isset($val[$key]))
- {
- unset($val[$key]);
- }
- $session_id = self::$session_id;
- $session_data = serialize($val);
- $session_expire = TIME + self::get_gc_maxtime();
- self::$dbo->query("update ".self::$table." set value='$session_data', expiry='$session_expire' where session_id='$session_id'");
- self::close();
- }
- self::$is_del = TRUE;
- }
- /**
- * 销毁
- *
- * */
- public static function destroy()
- {
- $session_id = self::get_session_id();
- $_COOKIE['WBSID'] = '';
- self::open();
- self::$dbo->query("delete from ".self::$table." where session_id='$session_id'");
- self::close();
- }
- /**
- * 读取 私有
- * */
- private static function read()
- {
- $session_id = self::$session_id;
- if (!$session_id) {
- $session_id = self::get_session_id();
- }
- if (!$session_id) return array();
- $user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? md5($_SERVER['HTTP_USER_AGENT']) : '';
- $client_ip = Fun::getIp();
- $session_expire = TIME - self::get_gc_maxtime();
- $rs = self::$dbo->fetchRow("select session_id, value, agent, ip from ".self::$table."
- where session_id='$session_id' and expiry>'$session_expire'");
- if (!$rs || $rs['agent'] != $user_agent || $rs['ip'] != $client_ip)
- {
- return FALSE;
- }
- self::$session_id = $rs['session_id'];
- return unserialize($rs['value']);
- }
- /**
- * session 写入 私有
- * */
- private static function write(array $session_data)
- {
- $session_id = self::$session_id;
- if (!$session_id)
- {
- $session_id = self::get_session_id();
- }
- $session_expire = TIME + self::get_gc_maxtime();
- $user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? md5($_SERVER['HTTP_USER_AGENT']) : '';
- $client_ip = Fun::getIp();
- $session_data = serialize($session_data);
- if (self::$session_id && self::$session_id === $session_id)
- {
- self::$dbo->query("update ".self::$table." set value='$session_data', expiry='$session_expire', agent='$user_agent', ip='$client_ip' where session_id='$session_id'");
- }
- else
- {
- self::$session_id = $session_id = self::create_session_id();
- self::$dbo->query("insert into ".self::$table."(session_id, value, expiry, agent, ip)
- values('$session_id', '$session_data', '$session_expire', '$user_agent', '$client_ip')");
- }
- return true;
- }
- /**
- * session 更新 私有
- * */
- private static function update()
- {
- if (!self::$is_update)
- {
- $session_id = self::$session_id;
- $session_expire = TIME + self::get_gc_maxtime();
- self::$dbo->query("update ".self::$table." set expiry='$session_expire' where session_id='$session_id'");
- }
- self::$is_update = TRUE;
- }
- private static function close()
- {
- if (!self::$is_gc && mt_rand(1, self::$gc_rate_de)%self::$gc_rate_co == 0)
- {
- self::gc();
- }
- self::$is_gc = TRUE;
- }
- /**
- * 过期session 清除 随机触发
- * */
- private static function gc()
- {
- $session_expire = TIME - self::get_gc_maxtime();
- self::$dbo->query("delete from ".self::$table." where expiry<'$session_expire'");
- }
- private static function get_session_id()
- {
- if (isset($_COOKIE['WBSID']) && strlen($_COOKIE['WBSID'])==32)
- {
- $sid = $_COOKIE['WBSID'];
- setcookie('WBSID', $sid, TIME + self::get_gc_maxtime(), self::$path, self::$domain, self::$secure, self::$httponly);
- return $sid;
- }
- return null;
- }
- private static function create_session_id()
- {
- $sid = self::get_session_id();
- if (!$sid)
- {
- $sid = Fun::getIp() . TIME . microtime(TRUE) . mt_rand(mt_rand(0, 100), mt_rand(100000, 90000000));
- $sid = md5(self::$pre_key . $sid);
- setcookie('WBSID', substr($sid, 0, 32), TIME + self::get_gc_maxtime(), self::$path, self::$domain, self::$secure, self::$httponly);
- }
- return $sid;
- }
- public static function get_gc_maxtime()
- {
- return self::$gc_max_time;
- }
- }
希望本文所述对大家的php程序设计有所帮助。
Tags: session数据库交互
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