<?

$timelim=20; 

session_id("hfJKcbJssJ");  

session_start();  

$f=1;  

if(!isset($_SESSION['kolvo']))   

    $_SESSION['kolvo']=0;  

if($_SESSION['kolvo']>0)  

{  

  for($i=0;$i<$_SESSION['kolvo'];$i++) 

    if($_SESSION['users']['ip'][$i]==$_SERVER['REMOTE_ADDR'])  

      {  

      $_SESSION['users']['date'][$i]=date('U');  

      $f=0;  

      break;  

      }  



if($_SESSION['kolvo']>0)        

for($i=0;$i<$_SESSION['kolvo'];$i++) 

   if(date('U')-$_SESSION['users']['date'][$i]>$timelim)  

   { for($j=$i;$j<$_SESSION['kolvo']-1;$j++)  

      {  

      $_SESSION['users']['date'][$j]=$_SESSION['users']['date'][$j+1];  

      $_SESSION['users']['ip'][$j]=$_SESSION['users']['ip'][$j+1]; 

      }  

     $_SESSION['kolvo']--;  

    }  

}  

if($f)  

{  

  $_SESSION['users']['ip'][$_SESSION['kolvo']]=$_SERVER['REMOTE_ADDR'];  

  $_SESSION['users']['date'][$_SESSION['kolvo']]=date('U');  

  $_SESSION['kolvo']++;  

}  

echo "<b>Онлайн:</b> ".$_SESSION['kolvo'];



?>