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;

	}

} );

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