Gegevens ophalen en het getal updaten.

<?php 
$query = "UPDATE linken SET stats=+1 WHERE id=2"; 
mysql_query($query) or die (mysql_error()); 
?> 

<?php 
$query = "UPDATE linken SET stats=+1 WHERE id=2"; 
mysql_query($query) or die (mysql_error()); 
?>

if(isset($_GET['id']) && is_numeric($_GET['id']))
{
   // hier selecteer je alle info over de link, ik veronderstel dat je de url even in $url bewaard.
   mysql_query("UPDATE links SET clicks=clicks+1 WHERE id='".mysql_real_escape_string($_GET['id'])."'");
   header('location: '.$url);
}

if(isset($_GET['id']) && is_numeric($_GET['id']))
{
   // hier selecteer je alle info over de link, ik veronderstel dat je de url even in $url bewaard.
   mysql_query("UPDATE links SET clicks=clicks+1 WHERE id='".mysql_real_escape_string($_GET['id'])."'");
   header('location: '.$url);
}