p>
$time=getdate();
$tt=$time[year]*365*24*60+$time[mon]*30*24*60+$time[mday]*24*60+$time[hours]*60+$time[minutes];
if($userid!=guest){
$sqlqq=update $user_attr_table set time=$tt,status=1 where userid='$userid';
mysql_query($sqlqq);}
$sqlq=select status,userid,time from $user_attr_table where status=1;;
  $resultq=mysql_query($sqlq) or die(mysql_error());
  $countq=mysql_numrows($resultq);
for ($ii=0;$ii
 $rowq=mysql_fetch_array($resultq);
       $useridq=$rowq[userid];
    $times=$rowq[time];
$ts=$tt-$times;
if($ts>=15)
{
$sqls=update $user_attr_table set status=0 where userid='$useridq';
mysql_query($sqls);
}
}
?>
我把代码写下来，剩下的就看你们自己的了：）