WordPress widget template

widget-template.php

<? class MyWidget extends WP_Widget {
  
  /** Widget setup **/
  function MyWidget() {
    parent::WP_Widget(false, 
                      __( 'My Widget', 'mytextdomain' ),
                      ['description' => __( 'Displays a list of stuff', 'mytextdomain' )],
                      ['width'       => '400px']
    );
  }
  
  /** The back-end form **/
  function form( $instance ) {

  }
  
  /** Saving form data **/
  function update( $new_instance, $old_instance ) {

  }
  
  /** The front-end display **/
  function widget( $args, $instance ) {

  }
}

register_widget('MyWidget');