session 入库

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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'];            ?>
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