Make permalinks unique

/**
 * Method 1. Force the unique custom permalinks
 */
function pm_force_unique_permalinks($uris) {
    $duplicates = array_count_values($uris);

    foreach($duplicates as $uri => $count) {
        if($count == 1) { continue; }

        $ids = array_keys($uris, $uri);

        foreach($ids as $index => $id) {
            if($index > 0) {
                $uris[$id] = preg_replace('/(.+?)(\.[^\.]+$|$)/', '$1-' . $index . '$2', $uri);
            }
        }
    }

    return $uris;
}
add_filter('permalink_manager_uris', 'pm_force_unique_permalinks', 10);

/**
 * Method 2. Make the default permalinks unique
 */
function pm_make_uris_unique($default_uri, $original_slug, $element, $custom_slug, $native_uri) {
    global $permalink_manager_uris;

    // if($native_uri ) { return $default_uri; }

    // Get the element ID
    $element_id = (!empty($element->taxonomy)) ? "tax-{$element->term_taxonomy_id}" : $element->ID;

    // Check if the same URI was used for another post or term
    $all_uris = $permalink_manager_uris;

    if(in_array($default_uri, $all_uris)) {
        unset($all_uris[$element_id]);

        $duplicates = array_count_values($all_uris);
        $duplicates_count = (isset($duplicates[$default_uri])) ? $duplicates[$default_uri] : 0;

        if($duplicates_count) {
            $suffix = intval($duplicates_count) + 1;
            $default_uri = preg_replace('/(.+?)(\.[^\.]+$|$)/', '$1-' . $suffix . '$2', $default_uri);
        }
    }

    return $default_uri;
}
add_filter('permalink_manager_filter_default_post_uri', 'pm_make_uris_unique', 99, 5);
add_filter('permalink_manager_filter_default_term_uri', 'pm_make_uris_unique', 99, 5);