Ticket #18746: 18746.patch

query.php

@@ -249 +249 @@
  * @since 2.3.0
  * @uses $wp_query
  *
- * @param mixed $slug Optional. Tag slug or array of slugs.
+ * @param mixed $tag Optional. Tag ID, name, slug, or array of Tag IDs, names, and slugs.
  * @return bool
  */
-function is_tag( $slug = '' ) {
+function is_tag( $tag = '' ) {
         global $wp_query;
 
         if ( ! isset( $wp_query ) ) {
@@ -260 +260 @@
                 return false;
         }
 
-        return $wp_query->is_tag( $slug );
+        return $wp_query->is_tag( $tag );
 }
 
 /**
@@ -3117 +3117 @@
          *
          * @since 3.1.0
          *
-         * @param mixed $slug Optional. Tag slug or array of slugs.
+         * @param mixed $tag Optional. Tag ID, name, slug, or array of Tag IDs, names, and slugs.
          * @return bool
          */
-        function is_tag( $slug = '' ) {
+        function is_tag( $tag = '' ) {
                 if ( !$this->is_tag )
                         return false;
 
-                if ( empty( $slug ) )
+                if ( empty($tag) )
                         return true;
 
                 $tag_obj = $this->get_queried_object();
 
-                $slug = (array) $slug;
+                $tag = (array) $tag;
 
-                if ( in_array( $tag_obj->slug, $slug ) )
+                if ( in_array( $tag_obj->term_id, $tag ) )
                         return true;
+                elseif ( in_array( $tag_obj->name, $tag ) )
+                        return true;
+                elseif ( in_array( $tag_obj->slug, $tag ) )
+                        return true;
 
                 return false;
         }