php基于session实现数据库交互的类实例

 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() { $s<i style="color:transparent">来源gaodai$ma#com搞$$代**码网</i>ession_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; } }