barryhughes · September 18, 2024 23:40
diff --git a/single-product-canonical-redirect.php b/single-product-canonical-redirect.php
 <?php

 /**
 * When the product permalink structure is `product/%product_cat%`, WooCommerce (9.3.x or earlier)
 * accepts any value as the `%product_cat%`, which is not always desirable. 
 * 
 * This snippet attempts to detect this situation, and will redirect to the canonical URL as needed.
 * You can add it as a mu-plugin. For example:
 * 
 *     wp-content/mu-plugins/canonical-product-redirect.php
 *
 * ⚠ This outlines a possible solution, but every site is different so be sure to test and be ready
 *    to remove it in the event it causes problems.
 */
 add_action( 
 	'template_redirect', 
 	function () {
 		global $wp_rewrite;
 	
 		// Go no further if WooCommerce did not initialize, if we are not looking at a request
 		// for a single product, or if the $wp_rewrite global is unavailable.
 		if (
 			! did_action( 'woocommerce_init' )
 			|| ! is_product()
 			|| ! is_a( $wp_rewrite, WP_Rewrite::class )
 		) {
 			return;
 		}
 	
 		// In the event we are dealing with ugly permalinks, this will be empty.
 		$specified_category_slug = get_query_var( 'product_cat' );
 	
 		// If we cannot determine that a category slug was passed via the permalink, go no further.
 		if ( ! is_string( $specified_category_slug ) || strlen( $specified_category_slug ) < 1 ) {
 			return;
 		}
 	
 		// What category slug did we expect? Normally this maps back to the first assigned product_cat
 		// term. However, this is filterable so we use the relevant helper function to figure this out.
 		$expected_category_slug = wc_product_post_type_link( '%product_cat%', get_post( get_the_ID() ) );
 	
 		// If the provided and expected category slugs match, go no further.
 		if ( $specified_category_slug === $expected_category_slug ) {
 			return;
 		}
 	
 		// Redirect along with any query vars.
 		$query_vars = isset( $_GET ) && is_array( $_GET ) ? $_GET : array();
 		wp_safe_redirect( add_query_arg( $query_vars, wc_get_product( get_the_ID() )->get_permalink() ) );
 		exit();
 	}
 );
	<?php

	/**
	* When the product permalink structure is `product/%product_cat%`, WooCommerce (9.3.x or earlier)
	* accepts any value as the `%product_cat%`, which is not always desirable.
	*
	* This snippet attempts to detect this situation, and will redirect to the canonical URL as needed.
	* You can add it as a mu-plugin. For example:
	*
	* wp-content/mu-plugins/canonical-product-redirect.php
	*
	* ⚠ This outlines a possible solution, but every site is different so be sure to test and be ready
	* to remove it in the event it causes problems.
	*/
	add_action(
	'template_redirect',
	function () {
	global $wp_rewrite;

	// Go no further if WooCommerce did not initialize, if we are not looking at a request
	// for a single product, or if the $wp_rewrite global is unavailable.
	if (
	! did_action( 'woocommerce_init' )
	\|\| ! is_product()
	\|\| ! is_a( $wp_rewrite, WP_Rewrite::class )
	) {
	return;
	}

	// In the event we are dealing with ugly permalinks, this will be empty.
	$specified_category_slug = get_query_var( 'product_cat' );

	// If we cannot determine that a category slug was passed via the permalink, go no further.
	if ( ! is_string( $specified_category_slug ) \|\| strlen( $specified_category_slug ) < 1 ) {
	return;
	}

	// What category slug did we expect? Normally this maps back to the first assigned product_cat
	// term. However, this is filterable so we use the relevant helper function to figure this out.
	$expected_category_slug = wc_product_post_type_link( '%product_cat%', get_post( get_the_ID() ) );

	// If the provided and expected category slugs match, go no further.
	if ( $specified_category_slug === $expected_category_slug ) {
	return;
	}

	// Redirect along with any query vars.
	$query_vars = isset( $_GET ) && is_array( $_GET ) ? $_GET : array();
	wp_safe_redirect( add_query_arg( $query_vars, wc_get_product( get_the_ID() )->get_permalink() ) );
	exit();
	}
	);