/** * Disable out of stock variations * * @param bool $active * @param WC_Product_Variation $variation * * @return Boolean */ function iconic_variation_is_active( $active, $variation ) { if( ! $variation->is_in_stock() ) { return false; } return $active; } add_filter( 'woocommerce_variation_is_active', 'iconic_variation_is_active', 10, 2 );