Multisite Plugin for the WP Austin Meetup Group

wpatx-sites.php

<?php
/*
Plugin Name: WP-ATX MS Demo
Plugin URI: http://wpaustin.com
Description: Demoing WordPress Multisite Features
Version: 0.1
Author: ryanshoover
License: GPLv2 or later
Text Domain: wpatxms
*/

function wpatx_sites() {
	// $sites = get_sites();

	$site_query = new WP_Site_Query( [ 'site__not_in' => get_current_blog_id() ] );

	$sites = $site_query->get_sites();

	$html = '<div class="sites">';

	foreach ( $sites as $site ) {
		$title = get_blog_option( $site->blog_id, 'blogname' );
		$desc  = get_blog_option( $site->blog_id, 'blogdescription' );

		$html .= '<div class="site">';

		$html .= '<h2>' . $title . '</h2>';

		$html .= '<p>' . $desc . '</p>';

		switch_to_blog( $site->blog_id );

		$post_query = new WP_Query( [ 'posts_per_page' => 3 ] );

		if ( $post_query->have_posts() ) {

			$html .= '<ul>';

			while( $post_query->have_posts() ) {
				$post_query->the_post();

				$post_title = get_the_title();
				$post_link = get_permalink( get_the_ID() );

				$html .= sprintf( '<li><a href="%s">%s</a></li>', $post_link, $post_title );
			}

			$html .= '</ul>';
		}

		wp_reset_postdata();

		$html .= '</div>';
	}

	restore_current_blog();

	$html .= '</div>';

	return $html;
}

add_shortcode( 'wpatxsites', 'wpatx_sites' );