/** * Adds and displays the "Product metadata" meta box. * * @see https://wpcodebook.com/woocommerce-product-metadata-meta-box/ * @see https://developer.wordpress.org/reference/hooks/add_meta_boxes/ * @see https://developer.wordpress.org/reference/functions/add_meta_box/ * @see https://developer.wordpress.org/reference/functions/get_post_meta/ */ add_action( 'add_meta_boxes', function ( $post_type, $post ) { add_meta_box( 'wpcodebook-product-metadata-meta-box', esc_html__( 'Product metadata' ), function ( $post ) { echo '<pre>' . print_r( get_post_meta( $post->ID ), true ) . '</pre>'; }, 'product' ); }, 10, 2 );