--- C:/Documents/Web/drupal-5.1/modules/statistics/statistics.module.old	Wed Jan 10 10:17:51 2007
+++ C:/Documents/Web/drupal-5.1/modules/statistics/statistics.module	Tue Apr 24 10:57:16 2007
@@ -57,12 +57,17 @@
   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());
+      // If we want only unique views, check to see if the user has seen this node already
+      // Previous visits for authenticed users is in the history table
+      // For anonymous users, we check the session id in the access_log table
+      if (!variable_get('statistics_count_unique_views', 0) || !($user->uid ? db_num_rows(db_query("SELECT timestamp FROM {history} WHERE uid = %d AND nid = %d", $user->uid, arg(1))) : db_num_rows(db_query("SELECT aid FROM {accesslog} WHERE uid = 0 AND sid = '%s' AND path = '%s'", $_GET['q'], session_id())))) {
+        // 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());
+        }
       }
     }
   }
@@ -389,6 +394,11 @@
     '#default_value' => variable_get('statistics_count_content_views', 0),
     '#options' => $options,
     '#description' => t('Increment a counter each time content is viewed.'));
+  $form['content']['statistics_count_unique_views'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Only count unique views'),
+    '#default_value' => variable_get('statistics_count_unique_views', 0),
+    '#description' => t('Only count one view for each registered user and each anonymous user session.'));
 
   return system_settings_form($form);
 }