Ticket #52728: 52728.2.diff

src/wp-includes/class-wp-widget.php

@@ -358 +358 @@
                 $this->_set( $widget_args['number'] );
                 $instances = $this->get_settings();
 
-                if ( array_key_exists( $this->number, $instances ) ) {
+                if ( isset( $instances[ $this->number ] ) ) {
                         $instance = $instances[ $this->number ];
 
                         /**

tests/phpunit/tests/widgets.php

@@ -590 +590 @@
 
         // @todo Test WP_Widget::display_callback().
 
+        /**
+         * @ticket 52728
+         */
+        function test_widget_display_callback_handles_arrayobject() {
+                $widget = new WP_Widget_Text();
+
+                register_widget( $widget );
+
+                update_option(
+                        $widget->option_name,
+                        new ArrayObject(
+                                array(
+                                        2              => array( 'title' => 'Test Title' ),
+                                        '_multiwidget' => 1,
+                                        '__i__'        => true,
+                                )
+                        )
+                );
+
+                ob_start();
+                $widget->display_callback(
+                        array(
+                                'before_widget' => '<section>',
+                                'after_widget'  => "</section>\n",
+                                'before_title'  => '<h2>',
+                                'after_title'   => "</h2>\n",
+                        ),
+                        2
+                );
+                $actual = ob_get_clean();
+
+                unregister_widget( $widget );
+
+                $this->assertContains( 'Test Title', $actual );
+        }
+
         /**
          * @see WP_Widget::is_preview()
          */