Redirect product variation SKU URLs to parent

Fixes 404s of old product slugs that were converted to variations. 301 redirects traffic to the new parent product matched by SKU and pre-selects the variation.

add_action( 'template_redirect', function() {

	// 404 Situations Only
	if( ! is_404() ) {
		return;
	}

	// Get URI
	$uri = parse_url( $_SERVER['REQUEST_URI'] );

	// Get URI Path
	if( empty( $uri['path'] ) ) {
		return;
	}
	$path = untrailingslashit( $uri['path'] );

	// Product URLs Only
	if( ! preg_match( '#/product/(.*)#', $path, $matches ) ) {
		return;
	}

	// Find Product
	$product_id = wc_get_product_id_by_sku( $matches[1] );
	if( $product_id ) {
		$product = wc_get_product( $product_id );

		// Redirect
		wp_redirect( $product->get_permalink(), 301 );
		exit;

	}

} );

Instructions for Redirect product variation SKU URLs to parent

  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

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