Code-Snippets-Functions/Execute a function on a child site/WooCommerce/show-the-price-difference-product-variations.txt

add_filter( 'woocommerce_available_variation', 'filter_available_variation_attributes', 10, 3 );
function filter_available_variation_attributes( $data, $product, $variation ){
    $price_min  = $product->get_variation_regular_price('min', true); // Min price for display
    $price_diff = $data['display_price'] - $price_min;

    if ($price_diff > 0 ) {
        $data['price_html'] = '<span class="price">' . $variation->get_price_html() . ' <em>(+' . wc_price( $price_diff ) . ')</em></span>';
    }
    return $data;
}