1// Add a custom function to the 'template_redirect' action
 2add_action('template_redirect', function () {
 3    // If the current request is not a 404 error, exit the function
 4    if (!is_404()) {
 5        return;
 6    }
 7 
 8    // Generate a unique cache key for the current request URI
 9    $cache_key = 'redirect_' . md5($_SERVER['REQUEST_URI']);
10 
11    // Try to get the redirect URL from the cache
12    $redirect = get_transient($cache_key);
13 
14    // If the redirect URL is not in the cache, calculate it
15    if ($redirect === false) {
16        // Default redirect URL is the home page
17        $redirect = '/';
18 
19        // Split the request URI into segments
20        $paths = explode('/', trim(parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH), '/'));
21 
22        // Determine which segment to use based on its existence and non-emptiness
23        if (isset($paths[2]) && !empty($paths[2])) {
24            $path = explode('-', $paths[2]);
25        } else {
26            $path = explode('-', $paths[1]);
27        }
28 
29        // Try to find a product with the given path
30        if ($prod = get_page_by_path($paths[1], OBJECT, 'product')) {
31            $redirect = get_permalink($prod);
32        } else {
33            // If no product is found, try to find a product category with a similar slug
34            while (!empty($path)) {
35                $slug = implode('-', $path);
36                if ($term = get_term_by('slug', $slug, 'product_cat')) {
37                    // If a product category is found, set the redirect URL to the category's term link
38                    $redirect = get_term_link($term);
39                    break;
40                }
41 
42                // Remove the last segment from the path and try again
43                array_pop($path);
44            }
45        }
46 
47        // Cache the calculated redirect URL for 12 hours
48        set_transient($cache_key, $redirect, 12 * HOUR_IN_SECONDS);
49    }
50 
51    // Redirect the user to the calculated URL
52    wp_redirect($redirect);
53    exit();
54});