WooCommerce: Automatically Add Tag To Purchased Products

This functionality can be helpful to those who need to differentiate purchased products from non-purchased ones. Think about a way to automatically discount non-tagged products, in order to entice more sales; or a function that only shows purchased products via a custom shortcode.

No matter the application, “tagging” products upon purchase is super easy. Of course, make sure to create a custom product tag first, and get its ID, so that you can use this in the code below. Enjoy!

PHP Snippet: Auto-tag Products Upon Purchase @ WooCommerce Thank You Page

/**
 * @snippet       Programmatically Tag Products
 * @how-to        businessbloomer.com/woocommerce-customization
 * @author        Rodolfo Melogli, Business Bloomer
 * @compatible    WooCommerce 7
 * @community     https://businessbloomer.com/club/
 */

add_action( 'woocommerce_thankyou', 'bbloomer_auto_tag_product' );

function bbloomer_auto_tag_product( $order_id ) {
	$order = wc_get_order( $order_id );
	$auto_tag_id = array( 12345 ); // YOUR TAG ID HERE
	foreach ( $order->get_items() as $item_id => $item ) {
		$product = $item->get_product();
		$tags = $product->get_tag_ids();
		if ( ! array_intersect( $tags, $auto_tag_id ) ) {
			$product->set_tag_ids( array_merge( $tags, $auto_tag_id ) );
			$product->save();
		}
	}
}

Where to add custom code?

You should place custom PHP in functions.php and custom CSS in style.css of your child theme: where to place WooCommerce customization?

This code still works, unless you report otherwise. To exclude conflicts, temporarily switch to the Storefront theme, disable all plugins except WooCommerce, and test the snippet again: WooCommerce troubleshooting 101

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Rodolfo Melogli

Business Bloomer Founder

Author, WooCommerce expert and WordCamp speaker, Rodolfo has worked as an independent WooCommerce freelancer since 2011. His goal is to help entrepreneurs and developers overcome their WooCommerce nightmares. Rodolfo loves travelling, chasing tennis & soccer balls and, of course, wood fired oven pizza. Follow @rmelogli