Ticket #4335: cat_id_order__branches_2.2.diff

wp-includes/link-template.php

@@ -77 +77 @@
                 $category = '';
                 if (strpos($permalink, '%category%') !== false) {
                         $cats = get_the_category($post->ID);
+                        if ( $cats )
+                                usort($cats, '_get_the_category_usort_by_ID'); // order by ID
                         $category = $cats[0]->category_nicename;
                         if ( $parent=$cats[0]->category_parent )
                                 $category = get_category_parents($parent, FALSE, '/', TRUE) . $category;

wp-includes/category-template.php

@@ -83 +83 @@
         return strcmp($a->category_name, $b->category_name);
 }
 
+function _get_the_category_usort_by_ID($a, $b) {
+        if ( $a->cat_ID > $b->cat_ID )
+                return 1;
+        elseif ( $a->cat_ID < $b->cat_ID )
+                return -1;
+        else
+                return 0;
+}
+
 function get_the_category_by_ID($cat_ID) {
         $cat_ID = (int) $cat_ID;
         $category = &get_category($cat_ID);