Remove specified products from cart when a trigger product is added

Removes one or more products from the cart when a specific product is added to the cart. Useful to be able to offer product upgrade links.

add_action( 'woocommerce_add_to_cart', function( $cart_item_key, $product_id ) {

	$remove = [];

	switch( $product_id ) {

		// Trigger Product ID
		case 1234:

			// Predecessor Product To Remove
			$remove[] = 1233;
			break;

	}

	// Loop Current Cart Items
	foreach( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
		if( in_array( $cart_item['product_id'], $remove ) ) {
			WC()->cart->remove_cart_item( $cart_item_key );
		}
	}

}, 10, 2 );

Instructions for Remove specified products from cart when a trigger product is added

  1. Log into a staging or locally hosted clone of your site.
  2. Install and activate Code Snippets plugin.
  3. WP Admin > Snippets > Add New
  4. Copy and paste the code from the section above.
  5. Check to ensure formatting came over properly.
  6. Customize the code as desired.
  7. Add a meaningful title.
  8. Select whether to run on front-end or back-end (or both).
  9. Click “Save and Activate”.
  10. Test your site to ensure it works.
  11. Disable if any problems, or recover.
  12. Repeat for live environment.

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License

All code snippets are licensed GPLv2 (or later) matching WordPress licensing.

Except when otherwise stated in writing the copyright holders and/or other parties provide the program as-is without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

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