Widget Area Shortcode

<?php

/*
Plugin Name: Widget Area Shortcode
Description: A shortcode to display a widget area.
Plugin URI: https://www.damiencarbery.com
Version: 0.1
Author: Damien Carbery
*/

defined( 'ABSPATH' ) || exit;

add_action( 'widgets_init', 'dcwd_register_sidebar_for_shortcode' );
function dcwd_register_sidebar_for_shortcode() {
    $args = array(
        'name'          => 'Shortcode',
        'id'            => 'sidebar-shortcode',
        'description'   => 'Sidebar that will be displayed via a shortcode.',
        'class'         => 'sidebar-shortcode',
        'before_widget' => '<div id="%1$s" class="widget %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<h2 class="widgettitle">',
        'after_title'   => '</h2>'
    );

    register_sidebar( $args );
}


add_shortcode( 'sidebar_display', 'dcwd_sidebar_display' );
function dcwd_sidebar_display() {
    if ( is_active_sidebar( 'sidebar-shortcode' ) ) {
        ob_start();
        dynamic_sidebar( 'sidebar-shortcode' );
        return ob_get_clean();
    }

    return '<p>sidebar not active.</p>';
}