WooCommerce 在多規格商品名稱上加上已售完字樣

gistfile1.txt

/**
 * 在多規格商品名稱上加上＂已售完＂字樣。
 *
 * @param string $option
 * @param null   $not_used
 * @param array  $attribute
 * @param object $product
 * @return void
 */
function add_sold_out_label_to_product_dropdown( $option, $not_used, $attribute, $product ){
	$sold_out_text  = __( '(已售完)', 'heromama' );
	$variations     = $product->get_available_variations();
	$attributes     = $product->get_attributes();
	$attribute_slug = get_attr_slug_by_title( $attribute, $attributes );

	if ( empty( $attribute_slug ) ) {
		return $option;
	}

	foreach ( $variations as $variation ) {
		if ( $variation['attributes']['attribute_' . $attribute_slug] === $option && $variation['is_in_stock'] === false ) {
			$option .= $sold_out_text;
		}
	}

	return $option;
}
add_filter( 'woocommerce_variation_option_name', 'add_sold_out_label_to_product_dropdown', 1, 4 );

/**
 * 回傳 attribute taxonomy
 *
 * @param $attribute_title
 * @param $attributes
 *
 * @return int|string
 */
function get_attr_slug_by_title( $attribute_title, $attributes ) {
	if ( empty( $attribute_title ) || empty( $attributes ) ) {
		__return_empty_string();
	}
	$att_slug = '';

	foreach( $attributes as $tax => $tax_obj ) {
		if ( $tax_obj[ 'name' ] === $attribute_title ) {
			$att_slug = $tax;
		}
	}
	return $att_slug;
}