user-network-post-counts.php

<?php
/**
 *  Plugin Name:       Users Network Post Counts
 *  Plugin URI:        http://limecuda.com
 *  Description:       Gets post counts for users across multisite network and updates meta on weekly cron
 *  Version:           1.0.0
 *  Author:            LimeCuda
 *  Author URI:        http://limecuda.com
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

// Create cron job on plugin activation
register_activation_hook( __FILE__, 'update_users_network_post_counts' );

/**
 * Schedule the cron job to run function for setting post counts for authors
 *
 * @since 1.0.0
 * @uses wp_schedule_event()
 */
function update_users_network_post_counts() {
	wp_schedule_event( time(), 'daily', 'update_users_network_post_counts_hook' );
}

add_action( 'update_users_network_post_counts_hook', 'as_users_network_post_count_set' );
/**
 * The users for the network are all subscribers on the main blog
 *
 * This function loops through those users, gets their associated blogs, loops
 * through those blogs and gets the post count for that user from each blog
 *
 * The sum of the counts is then saved as user meta with the meta key of
 * "network_post_count" for each user
 *
 * @since 1.0.0
 * @uses switch_to_blog()
 * @uses count_user_posts()
 * @uses update_user_meta()
 */
function as_users_network_post_count_set() {

	$args = array(
		'role' 		=> 'Subscriber',
		'fields' 	=> 'ID'
	);

	$users = new WP_User_Query( $args );

	// If we have users
	if( $users->results ) {

		// Loop through each of the users
		foreach( $users->results as $user_id ) {

			// Reset post count variable per user
			$network_post_count = array();

			// Get the users blogs and loop through them
			$blogs = get_blogs_of_user( $user_id );

			foreach( $blogs as $blog ) {

				switch_to_blog( $blog->userblog_id );

					// Update the post count array with post count from each blog
					$network_post_count[] = count_user_posts( $user_id );

				restore_current_blog();
			}

			// Get the total count of posts from each blog
			$network_post_count = array_sum( $network_post_count );
			$count = str_pad( $network_post_count, 2, '0', STR_PAD_LEFT );

			update_user_meta( $user_id, 'network_post_count', $count );
		}
	}
}