WooCommerce: Return an array of featured product IDs

woocommerce-return-array-of-featured-product-ids

/**
 * Return a list (array) of WooCommerce featured product IDs
 *
 * @author Wil Brown zeropointdevelopment.com
 * @return array|mixed
 */
function zpd_wc_get_featured_product_ids() {
    // Load from cache
    $featured_product_ids = get_transient( 'zpd_wc_featured_products' );

    // Valid cache found
    if ( false !== $featured_product_ids )
        return $featured_product_ids;

    $featured = get_posts( array(
        'post_type'      => array( 'product', 'product_variation' ),
        'posts_per_page' => -1,
        'post_status'    => 'publish',
        'meta_query'     => array(
            array(
                'key' 		=> '_visibility',
                'value' 	=> array('catalog', 'visible'),
                'compare' 	=> 'IN'
            ),
            array(
                'key' 	=> '_featured',
                'value' => 'yes'
            )
        ),
        'fields' => 'id=>parent'
    ) );

    // Make sure we get rid of any duplicates
    $product_ids = array_keys( $featured );
    $parent_ids  = array_values( $featured );
    $featured_product_ids = array_unique( array_merge( $product_ids, $parent_ids ) );

    set_transient( 'zpd_wc_featured_products', $featured_product_ids );

    return $featured_product_ids;
}

/**
 * Example Usage
 *
 * Use with the WC_Product_Factory object to get a WC_Product object for each ID.
 *
 * WC_Product documentation at https://woocommerce.github.io/code-reference/classes/WC-Product.html
 *
 */
$wc_pf = new WC_Product_Factory();
$featured_products_ids = zpd_wc_get_featured_product_ids();
if( $featured_products_ids ){
    foreach ( $featured_products_ids as $id ) {

        $wc_product = $wc_pf->get_product( id) ;

        // example, get the price
        $fp_price = $wc_product->get_price();
    }
}