Index: modules/statistics/statistics.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/statistics/statistics.module,v
retrieving revision 1.272
diff -u -r1.272 statistics.module
--- modules/statistics/statistics.module	4 Jan 2008 09:31:48 -0000	1.272
+++ modules/statistics/statistics.module	5 Feb 2008 00:59:55 -0000
@@ -50,12 +50,23 @@
   if (variable_get('statistics_count_content_views', 0)) {
     // We are counting content views.
     if ((arg(0) == 'node') && is_numeric(arg(1)) && arg(2) == '') {
-      // A node has been viewed, so update the node's counters.
-      db_query('UPDATE {node_counter} SET daycount = daycount + 1, totalcount = totalcount + 1, timestamp = %d WHERE nid = %d', time(), arg(1));
-      // If we affected 0 rows, this is the first time viewing the node.
-      if (!db_affected_rows()) {
-        // We must create a new row to store counters for the new node.
-        db_query('INSERT INTO {node_counter} (nid, daycount, totalcount, timestamp) VALUES (%d, 1, 1, %d)', arg(1), time());
+      switch (variable_get('statistics_enable_access_log', 0)) {
+        // With enabled access log, we can determine whether this is a unique
+        // page view or not. We are checking this by Session ID.
+        case TRUE:
+          $result = db_query("SELECT title FROM {accesslog} WHERE path = '%s' AND sid = '%s' AND uid = %d", $_GET['q'], session_id(), $user->uid); 
+          // Break, if this page has been already viewed in this session.
+          if (db_num_rows($result)) {
+            break;
+          }
+        // In all other cases increment the counter by one.
+        default:
+          db_query('UPDATE {node_counter} SET daycount = daycount + 1, totalcount = totalcount + 1, timestamp = %d WHERE nid = %d', time(), arg(1));
+          // If we didn't affect any row, this node has not yet been viewed by
+          // any user. Therefore we need to create a new row for this node.
+          if (!db_affected_rows()) {
+            db_query('INSERT INTO {node_counter} (nid, daycount, totalcount, timestamp) VALUES (%d, 1, 1, %d)', arg(1), time());
+          }
       }
     }
   }