session入mysql

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 <?php
 ini_set("session.save_handler","user");
 //session.gc_probability = 1 分子
 ini_set("session.gc_probability",1);
 //session.gc_divisor = 1000 分母
 ini_set("session.gc_divisor",2);
 //session.gc_maxlifetime = 1440 垃圾回收时间，session有效期
 $maxlifetime = ini_set("session.gc_maxlifetime");

 session_set_save_handler( "open","close","read","write","destroy","gc" );

 //连接数据库
 function open(){
     @$link = mysql_connect('127.0.0.1', 'root', 'root');
     mysql_query('set names utf8');
     mysql_query('use xxx');
 }
 function close(){
     mysql_close();
 }
 function read($sess_id){
     $sql = "select session_data from `session` where session_id = '$sess_id'";
     $result = mysql_query($sql);
     if($rows = mysql_fetch_assoc($result)){

         return $rows['session_data']; }else{
         return '';

     }
 }
 function write($sess_id,$sess_data){
     $sql = "insert into `session` (session_id,session_data,session_time) values('$sess_id','$sess_data', now())
 on duplicate key update session_data = '$sess_data' , session_time = now()
 ";  //这是为了gc()
     return mysql_query($sql);

 }
 function destroy($sess_id){
     echo __FUNCTION__;
     $sql = "delete from `session` where session_id = '$sess_id'";
     return mysql_query($sql);

 }
 function gc($sess_id){
     echo __FUNCTION__;
     $sql = "delete from `session` where now()-session_time > '$maxlifetime' ";
     return mysql_query($sql);
 }
 header("content-type:text/html;charset=utf8");
 session_start();
 $_SESSION['name']='zhangsan';
 //echo session_id();
 echo $_SESSION['name'];

 ?>