Example of WordPress coding standards

gistfile1.aw

<?php

add_filter( 'body_class' , 'ft_add_guest_body_class' );
/**
 * Adds a body class for guests.
 * 
 * @author Remkus de Vries
 * @link http://remkusdevries.com/when-sharing-wordpress-related-code-snippets-i-can-haz-standards-please/
 * @tested WordPress 3.2.1
 * @param array $classes Existing body classes
 * @return array Amended body classes
 */
function ft_add_guest_body_class( $classes ) {
	
	// add 'not-loggedin' to the $classes array
	
	if ( ! is_user_logged_in() )
		$classes[] = 'not-logged-in';
		
	// return the $classes array
	return $classes;

}