woocommerce-remove-virtual-billing-fields.php

<?php
/**
 * Plugin Name: WooCommerce Remove Billing Fields for Free Virtual Products
 * Plugin URI: https://gist.github.com/BFTrick/7873168
 * Description: Remove the billing address fields for free virtual orders
 * Author: Patrick Rauland
 * Author URI: http://patrickrauland.com/
 * Version: 1.0
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author    	Patrick Rauland
 * @since		1.0
 */

function patricks_billing_fields( $fields ) {
	global $woocommerce;

	// if the total is more than 0 then we still need the fields
	if ( 0 != $woocommerce->cart->total ) {
		return $fields;
	}

	// return the regular billing fields if we need shipping fields
	if ( $woocommerce->cart->needs_shipping() ) {
		return $fields;
	}

	// we don't need the billing fields so don't return them!
	return array();
}
add_filter( 'woocommerce_billing_fields', 'patricks_billing_fields', 20 );


/**
 * Change text strings
 *
 * @link http://codex.wordpress.org/Plugin_API/Filter_Reference/gettext
 */
function wc_billing_field_strings( $translated_text, $text, $domain ) {
	switch ( $translated_text ) {
		case 'Billing Address' :
			$translated_text = __( '', 'woocommerce' );
			break;
	}
	return $translated_text;
}
add_filter( 'gettext', 'wc_billing_field_strings', 20, 3 );


// That's all folks!