wp-slow-update-widget.php

<?php
/**
 * Widget that takes random 0-5 seconds to save.
 * 
 * @link https://github.com/xwp/wordpress-develop/pull/75/files
 * @link https://core.trac.wordpress.org/ticket/31501
 */

add_action( 'widgets_init', function () {

	class Slow_Update_Widget extends WP_Widget {

		/**
		 * Register widget with WordPress.
		 */
		function __construct() {
			parent::__construct(
				'slow_update', // Base ID
				__( 'Slow Update Widget', 'text_domain' ), // Name
				array( 'description' => __( 'A widget that takes 3 seconds to save.', 'text_domain' ), ) // Args
			);
		}

		/**
		 * Front-end display of widget.
		 *
		 * @see WP_Widget::widget()
		 *
		 * @param array $args     Widget arguments.
		 * @param array $instance Saved values from database.
		 */
		public function widget( $args, $instance ) {
			$instance = array_merge(
				array(
					'title' => '',
					'body' => '',
				),
				$instance
			);
			echo wp_kses_post( $args['before_widget'] );
			if ( ! empty( $instance['title'] ) ) {
				echo wp_kses_post( $args['before_title'] . apply_filters( 'widget_title', $instance['title'] ). $args['after_title'] );
			}
			echo wp_kses_post( $instance['body'] );
			echo wp_kses_post( $args['after_widget'] );
		}

		/**
		 * Back-end widget form.
		 *
		 * @see WP_Widget::form()
		 *
		 * @param array $instance Previously saved values from database.
		 * @return mixed
		 */
		public function form( $instance ) {
			$title = ! empty( $instance['title'] ) ? $instance['title'] : '';
			$body = ! empty( $instance['body'] ) ? $instance['body'] : '';
			?>
			<p>
				<label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php esc_html_e( 'Title:' ); ?></label>
				<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>">
			</p>
			<p>
				<label for="<?php echo esc_attr( $this->get_field_id( 'body' ) ); ?>"><?php esc_html_e( 'Body:' ); ?></label>
				<input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'body' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'body' ) ); ?>" type="text" value="<?php echo esc_attr( $body ); ?>">
			</p>
			<?php
		}

		/**
		 * Sanitize widget form values as they are saved.
		 *
		 * @see WP_Widget::update()
		 *
		 * @param array $new_instance Values just sent to be saved.
		 * @param array $old_instance Previously saved values from database.
		 *
		 * @return array Updated safe values to be saved.
		 */
		public function update( $new_instance, $old_instance ) {
			$instance = array();
			$instance['title'] = sanitize_text_field( $new_instance['title'] );
			$instance['body'] = sanitize_text_field( $new_instance['body'] );
			sleep( rand( 0, 5 ) );
			return $instance;
		}

	}
	register_widget( 'Slow_Update_Widget' );
});