WordPress - Make posts column sortable

sortable_posts_column.php

<?php
/*
Plugin Name: Sortable post column
Description: Make posts column on users screen sortable
Version: 0.0.1
Author: Ralf Albert
Author URI: http://yoda.neun12.de 
*/

// make posts-column sortable
add_filter( 'manage_users_sortable_columns', 'register_user_post_column_sortable' );

function register_user_post_column_sortable( $columns ){
	$columns['posts'] = array( 'post_count', 'desc' );
	return $columns;
}

/* PHP5.3 style */
/*
add_filter( 'manage_users_sortable_columns', 
	function( $columns ){		
		$columns['posts'] = array( 'post_count', 'desc' );
		
		return $columns;
	}
);
*/