diff --git a/core/includes/menu.inc b/core/includes/menu.inc
index a1c8a01..8026c44 100644
--- a/core/includes/menu.inc
+++ b/core/includes/menu.inc
@@ -775,7 +775,7 @@ function _menu_build_tree($menu_name, array $parameters = array()) {
  *   An array in which to store the collected node links.
  */
 function menu_tree_collect_node_links(&$tree, &$node_links) {
-  foreach ($tree as $key => $v) {
+  foreach (array_keys($tree) as $key) {
     if ($tree[$key]['link']['router_path'] == 'node/%') {
       $nid = substr($tree[$key]['link']['link_path'], 5);
       if (is_numeric($nid)) {
@@ -811,8 +811,8 @@ function menu_tree_check_access(&$tree, $node_links = array()) {
     $select->addTag('node_access');
     $nids = $select->execute()->fetchCol();
     foreach ($nids as $nid) {
-      foreach ($node_links[$nid] as $mlid => $link) {
-        $node_links[$nid][$mlid]['access'] = TRUE;
+      foreach ($node_links[$nid] as &$link) {
+        $link['access'] = TRUE;
       }
     }
   }
@@ -824,7 +824,7 @@ function menu_tree_check_access(&$tree, $node_links = array()) {
  */
 function _menu_tree_check_access(&$tree) {
   $new_tree = array();
-  foreach ($tree as $key => $v) {
+  foreach (array_keys($tree) as $key) {
     $item = &$tree[$key]['link'];
     _menu_link_translate($item);
     if ($item['access'] || ($item['in_active_trail'] && strpos($item['href'], '%') !== FALSE)) {
@@ -1385,7 +1385,7 @@ function menu_set_active_trail($new_trail = NULL) {
       // a stripped down menu tree containing the active trail only, in case
       // the given menu has not been built in this request yet.
       $tree = menu_tree_page_data($preferred_link['menu_name'], NULL, TRUE);
-      list($key, $curr) = each($tree);
+      list(, $curr) = each($tree);
     }
     // There is no link for the current path.
     else {
@@ -1414,7 +1414,7 @@ function menu_set_active_trail($new_trail = NULL) {
         }
         $tree = $curr['below'] ? $curr['below'] : array();
       }
-      list($key, $curr) = each($tree);
+      list(, $curr) = each($tree);
     }
     // Make sure the current page is in the trail to build the page title, by
     // appending either the preferred link or the menu router item for the