Using WordPress ‘do_redirect_guess_404_permalink’ PHP filter

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The do_redirect_guess_404_permalink WordPress PHP filter allows you to control whether WordPress should try to guess a redirect URL for a 404 request or not.

Usage

add_filter('do_redirect_guess_404_permalink', 'your_custom_function_name');

function your_custom_function_name($do_redirect_guess) {
    // Your custom code here
    return $do_redirect_guess;
}

Parameters

  • $do_redirect_guess (bool): Whether to attempt to guess a redirect URL for a 404 request. Default is true.

More information

See WordPress Developer Resources: do_redirect_guess_404_permalink

Examples

Disable URL guessing for 404 requests

Prevent WordPress from trying to guess a redirect URL for a 404 request.

add_filter('do_redirect_guess_404_permalink', '__return_false');

Enable URL guessing only for certain user roles

Allow URL guessing for 404 requests only for users with the “administrator” role.

add_filter('do_redirect_guess_404_permalink', 'enable_url_guessing_for_admins');

function enable_url_guessing_for_admins($do_redirect_guess) {
    if (current_user_can('administrator')) {
        return true;
    }
    return false;
}

Disable URL guessing for specific post types

Prevent URL guessing for 404 requests related to the “custom_post_type” post type.

add_filter('do_redirect_guess_404_permalink', 'disable_url_guessing_for_cpt');

function disable_url_guessing_for_cpt($do_redirect_guess) {
    if (is_singular('custom_post_type')) {
        return false;
    }
    return $do_redirect_guess;
}

Enable URL guessing only for logged-in users

Allow URL guessing for 404 requests only for logged-in users.

add_filter('do_redirect_guess_404_permalink', 'enable_url_guessing_for_logged_in_users');

function enable_url_guessing_for_logged_in_users($do_redirect_guess) {
    if (is_user_logged_in()) {
        return true;
    }
    return false;
}

Disable URL guessing on specific pages

Prevent URL guessing for 404 requests on a specific page with the ID “123”.

add_filter('do_redirect_guess_404_permalink', 'disable_url_guessing_on_specific_page');

function disable_url_guessing_on_specific_page($do_redirect_guess) {
    if (is_page(123)) {
        return false;
    }
    return $do_redirect_guess;
}