function wc_get_product_class( $class = '', $product = null ) {
	if ( is_null( $product ) && ! empty( $GLOBALS['product'] ) ) {
		// Product was null so pull from global.
		$product = $GLOBALS['product'];
	}

	if ( $product && ! is_a( $product, 'WC_Product' ) ) {
		// Make sure we have a valid product, or set to false.
		$product = wc_get_product( $product );
	}

	if ( $class ) {
		if ( ! is_array( $class ) ) {
			$class = preg_split( '#\s+#', $class );
		}
	} else {
		$class = array();
	}

	$post_classes = array_map( 'esc_attr', $class );

	if ( ! $product ) {
		return $post_classes;
	}

	// Run through the post_class hook so 3rd parties using this previously can still append classes.
	// Note, to change classes you will need to use the newer woocommerce_post_class filter.
	// @internal This removes the wc_product_post_class filter so classes are not duplicated.
	$filtered = has_filter( 'post_class', 'wc_product_post_class' );

	if ( $filtered ) {
		remove_filter( 'post_class', 'wc_product_post_class', 20 );
	}

	$post_classes = apply_filters( 'post_class', $post_classes, $class, $product->get_id() );

	if ( $filtered ) {
		add_filter( 'post_class', 'wc_product_post_class', 20, 3 );
	}

	$classes = array_merge(
		$post_classes,
		array(
			'product',
			'type-product',
			'post-' . $product->get_id(),
			'status-' . $product->get_status(),
			wc_get_loop_class(),
			$product->get_stock_status(),
		),
		wc_get_product_taxonomy_class( $product->get_category_ids(), 'product_cat' ),
		wc_get_product_taxonomy_class( $product->get_tag_ids(), 'product_tag' )
	);

	if ( $product->get_image_id() ) {
		$classes[] = 'has-post-thumbnail';
	}
	if ( $product->get_post_password() ) {
		$classes[] = post_password_required( $product->get_id() ) ? 'post-password-required' : 'post-password-protected';
	}
	if ( $product->is_on_sale() ) {
		$classes[] = 'sale';
	}
	if ( $product->is_featured() ) {
		$classes[] = 'featured';
	}
	if ( $product->is_downloadable() ) {
		$classes[] = 'downloadable';
	}
	if ( $product->is_virtual() ) {
		$classes[] = 'virtual';
	}
	if ( $product->is_sold_individually() ) {
		$classes[] = 'sold-individually';
	}
	if ( $product->is_taxable() ) {
		$classes[] = 'taxable';
	}
	if ( $product->is_shipping_taxable() ) {
		$classes[] = 'shipping-taxable';
	}
	if ( $product->is_purchasable() ) {
		$classes[] = 'purchasable';
	}
	if ( $product->get_type() ) {
		$classes[] = 'product-type-' . $product->get_type();
	}
	if ( $product->is_type( 'variable' ) && $product->get_default_attributes() ) {
		$classes[] = 'has-default-attributes';
	}

	// Include attributes and any extra taxonomies only if enabled via the hook - this is a performance issue.
	if ( apply_filters( 'woocommerce_get_product_class_include_taxonomies', false ) ) {
		$taxonomies = get_taxonomies( array( 'public' => true ) );
		$type       = 'variation' === $product->get_type() ? 'product_variation' : 'product';
		foreach ( (array) $taxonomies as $taxonomy ) {
			if ( is_object_in_taxonomy( $type, $taxonomy ) && ! in_array( $taxonomy, array( 'product_cat', 'product_tag' ), true ) ) {
				$classes = array_merge( $classes, wc_get_product_taxonomy_class( (array) get_the_terms( $product->get_id(), $taxonomy ), $taxonomy ) );
			}
		}
	}

	/**
	 * WooCommerce Post Class filter.
	 *
	 * @since 3.6.2
	 * @param array      $classes Array of CSS classes.
	 * @param WC_Product $product Product object.
	 */
	$classes = apply_filters( 'woocommerce_post_class', $classes, $product );

	return array_map( 'esc_attr', array_unique( array_filter( $classes ) ) );
}