WooCommerce - Google Merchant xml feed generator

index.php

<?php header( 'Content-type: text/xml' ) ?>
<?php echo '<?xml version="1.0"?>' ?>
<rss xmlns:g="http://base.google.com/ns/1.0" version="2.0">
    <channel>
        <title><?php echo bloginfo( 'name' ) ?></title>
        <link><?php echo home_url() ?></link>
        <description><?php echo bloginfo( 'description' ) ?></description>

        <?php
            $query = new WP_Query( array(
            'post_type' => 'product',
            'posts_per_page' => -1,
            'post_status' => 'publish'
            ) );
        ?>

        <?php while ($query->have_posts()) : $query->the_post(); ?>

            <?php $product = wc_get_product( get_the_ID() ); ?>

            <?php if ( $product->get_type() == 'simple' ) : ?>

                <?php if ( $product->is_in_stock() ) : ?>

                    <?php $price = $product->get_sale_price() == '' ? $product->get_regular_price() : $product->get_sale_price() ?>
                    <item>
                        <g:id><?php echo $product->get_sku() ?></g:id>
                        <g:title><?php the_title() ?></g:title>
                        <g:description><?php echo strip_tags( get_the_excerpt() ) ?></g:description>
                        <g:link><?php the_permalink() ?></g:link>
                        <g:image_link><?php $img = wp_get_attachment_image_src( get_post_thumbnail_id( get_the_ID() ) ); echo $img[0]; ?></g:image_link>
                        <g:condition>new</g:condition>
                        <g:availability>in stock</g:availability>
                        <g:price><?php echo $product->get_sale_price() ?></g:price>
                        <g:brand><?php echo bloginfo( 'name' ) ?></g:brand>
                        <g:mpn>FALSE</g:mpn>
                    </item>

                <?php endif ?>

            <?php else : ?>

                <?php $product_variation = $product->get_children() ?>

                <?php foreach ($product_variation as $key => $value): ?>

                    <?php if ( $product->is_in_stock() ) : ?>

                        <?php $product = $product->get_child( $value ) ?>
                        <?php $price = $product->get_sale_price() == '' ? $product->get_regular_price() : $product->get_sale_price() ?>
                        <item>
                            <g:id><?php echo $product->get_sku() ?></g:id>
                            <g:title><?php the_title() ?></g:title>
                            <g:description><?php echo strip_tags( get_the_excerpt() ) ?></g:description>
                            <g:link><?php the_permalink() ?></g:link>
                            <g:image_link><?php $img = wp_get_attachment_image_src( get_post_thumbnail_id( get_the_ID() ) ); echo $img[0]; ?></g:image_link>
                            <g:condition>new</g:condition>
                            <g:availability>in stock</g:availability>
                            <g:price><?php echo $price ?></g:price>
                            <g:brand><?php echo bloginfo( 'name' ) ?></g:brand>
                            <g:mpn>FALSE</g:mpn>
                        </item>

                    <?php endif ?>

                <?php endforeach ?>

            <?php endif ?>

        <?php endwhile ?>


    </channel>
</rss>