Ticket #16773: 16773.diff

wp-includes/widgets.php

@@ -91 +91 @@
          *       - height: currently not used but may be needed in the future
          */
         function __construct( $id_base = false, $name, $widget_options = array(), $control_options = array() ) {
-                $this->id_base = empty($id_base) ? preg_replace( '/(wp_)?widget_/', '', strtolower(get_class($this)) ) : strtolower($id_base);
+                $this->id_base = empty($id_base) ? preg_replace( '/(wp_)?widget_/', '', sanitize_key( get_class( $this ) ) ) : sanitize_key( $id_base );
                 $this->name = $name;
                 $this->option_name = 'widget_' . $this->id_base;
                 $this->widget_options = wp_parse_args( $widget_options, array('classname' => $this->option_name) );