


<?php/*============================文件说明========================================@filename: session.class.php@description: 数据库保存在线用户session,实现在线用户功能!@notice: session过期时间一个小时,因为我们的站点是使用cookie(有效时间是1小时)登录。 因此我们只记录用户登录的时间,而不是刷新一次更新一次 删除数据库中session记录的动作发生在用户超时后执行这个文件或正常退出(session_destory)@database: database:sessions field:sessionid(char32),uid(int10),last_visit(int10)=============================================================================*/class session { private $db; private $lasttime=3600;//超时时间:一个小时 function session(&$db) { $this->db = &$db; session_module_name('user'); //session文件保存方式,这个是必须的!除非在Php.ini文件中设置了 session_set_save_handler( array(&$this, 'open'), //在运行session_start()时执行 array(&$this, 'close'), //在脚本执行完成或调用session_write_close() 或 session_destroy()时被执行,即在所有session操作完后被执行 array(&$this, 'read'), //在运行session_start()时执行,因为在session_start时,会去read当前session数据 array(&$this, 'write'), //此方法在脚本结束和使用session_write_close()强制提交SESSION数据时执行 array(&$this, 'destroy'), //在运行session_destroy()时执行 array(&$this, 'gc') //执行概率由session.gc_probability 和 session.gc_divisor的值决定,时机是在open,read之后,session_start会相继执行open,read和gc ); session_start(); //这也是必须的,打开session,必须在session_set_save_handler后面执行 } function unserializes($data_value) { $vars = preg_split( '/([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)\|/', $data_value, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE ); for ($i = 0; isset($vars[$i]); $i++) { $result[$vars[$i++]] = unserialize($vars[$i]); } return $result; } function open($path, $name) { return true; } function close() { $this->gc($this->lasttime); return true; } function read($SessionKey){ $sql = "SELECT uid FROM sessions WHERE session_id = '".$SessionKey."' limit 1"; $query =$this->db->query($sql); if($row=$this->db->fetch_array($query)){ return $row['uid']; }else{ return ""; } } function write($SessionKey,$VArray) { require_once(MRoot.DIR_WS_CLASSES .'db_mysql_class.php'); $db1=new DbCom(); // make a connection to the database... now $db1->connect(DB_SERVER, DB_SERVER_USERNAME, DB_SERVER_PASSWORD, DB_DATABASE); $db1->query("set names utf8"); $this->db=$db1; $SessionArray = addslashes($VArray); $data=$this->unserializes($VArray); $sql0 = "SELECT uid FROM sessions WHERE session_id = '".$SessionKey."' limit 1"; $query0 =$this->db->query($sql0); if($this->db->num_rows($query0)<=0){ if (isset($data['webid']) && !empty($data['webid'])) { $this->db->query("insert into `sessions` set `session_id` = '$SessionKey',uid='".$data['webid']."',last_visit='".time()."'"); } return true; }else{ /*$sql = "update `sessions` set "; if(isset($data['webid'])){ $sql .= "uid = '".$data['webid']."', " ; } $sql.="`last_visit` = null " . "where `session_id` = '$SessionKey'"; $this->db->query($sql); */ return true; } } function destroy($SessionKey) { $this->db->query("delete from `sessions` where `session_id` = '$SessionKey'"); return true; } function gc($lifetime) { $this->db->query("delete from `sessions` where unix_timestamp(now()) -`last_visit` > '".$this->lasttime."'"); return true; } } ?>

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