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;">
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::$table."(session_id,expiry,ip)
values('$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,32),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。
