Disabilita le variazioni esaurite

function ace_grey_out_variations_when_out_of_stock( $is_active, $variation ) {
	if ( ! $variation->is_in_stock() ) {
		$is_active = false;
	}

	return $is_active;
}
add_filter( 'woocommerce_variation_is_active', 'ace_grey_out_variations_when_out_of_stock', 10, 2 );