php基于session实现数据库交互的类实例

php  /  管理员 发布于 7年前   178

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：

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。

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