Ticket #24878: 24878.diff

wp-includes/widgets.php

@@ -577 +577 @@
 }
 
 /**
+ * Checks if a sidebar is registered.
+ *
+ * @since  3.7.0
+ *
+ * @param string $name The ID of the sidebar when it was added.
+ *
+ * @return boolean True if the sidebar is registered, false otherwise.
+ */
+function is_registered_sidebar( $name ) {
+        global $wp_registered_sidebars;
+
+        if ( isset( $wp_registered_sidebars[$name] ) )
+                return true;
+        return false;
+}
+
+/**
  * Removes a sidebar from the list.
  *
  * @since 2.2.0
@@ -588 +605 @@
 function unregister_sidebar( $name ) {
         global $wp_registered_sidebars;
 
-        if ( isset( $wp_registered_sidebars[$name] ) )
+        if ( is_registered_sidebar( $name ) )
                 unset( $wp_registered_sidebars[$name] );
 }