WP_Widget_Calendar

17class WP_Widget_Calendar extends WP_Widget {18	/**19	 * Ensure that the ID attribute only appears in the markup once20	 *21	 * @since 4.4.022	 * @var int23	 */24	private static $instance = 0;25 26	/**27	 * Sets up a new Calendar widget instance.28	 *29	 * @since 2.8.030	 */31	public function __construct() {32		$widget_ops = array(33			'classname'                   => 'widget_calendar',34			'description'                 => __( 'A calendar of your site’s posts.' ),35			'customize_selective_refresh' => true,36			'show_instance_in_rest'       => true,37		);38		parent::__construct( 'calendar', __( 'Calendar' ), $widget_ops );39	}40 41	/**42	 * Outputs the content for the current Calendar widget instance.43	 *44	 * @since 2.8.045	 *46	 * @param array $args     Display arguments including 'before_title', 'after_title',47	 *                        'before_widget', and 'after_widget'.48	 * @param array $instance The settings for the particular instance of the widget.49	 */50	public function widget( $args, $instance ) {51		$title = ! empty( $instance['title'] ) ? $instance['title'] : '';52 53		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */54		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );55 56		echo $args['before_widget'];57		if ( $title ) {58			echo $args['before_title'] . $title . $args['after_title'];59		}60		if ( 0 === self::$instance ) {61			echo '<div id="calendar_wrap" class="calendar_wrap">';62		} else {63			echo '<div class="calendar_wrap">';64		}65		get_calendar();66		echo '</div>';67		echo $args['after_widget'];68 69		++self::$instance;70	}71 72	/**73	 * Handles updating settings for the current Calendar widget instance.74	 *75	 * @since 2.8.076	 *77	 * @param array $new_instance New settings for this instance as input by the user via78	 *                            WP_Widget::form().79	 * @param array $old_instance Old settings for this instance.80	 * @return array Updated settings to save.81	 */82	public function update( $new_instance, $old_instance ) {83		$instance          = $old_instance;84		$instance['title'] = sanitize_text_field( $new_instance['title'] );85 86		return $instance;87	}88 89	/**90	 * Outputs the settings form for the Calendar widget.91	 *92	 * @since 2.8.093	 *94	 * @param array $instance Current settings.95	 */96	public function form( $instance ) {