Nueva versión del plugin “Permalink Fix”

if (!defined('ABSPATH')) die;

// Based on sanitize_title_with_dashes method (wp-includes/formatting.php)
function custom_sanitize_title_with_dashes($title) {
        $title = strip_tags($title);
        // Preserve escaped octets.
        $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---1---', $title);
        // Remove percent signs that are not part of an octet.
        $title = str_replace('%', '', $title);
        // Restore octets.
        $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%1', $title);

        $title = remove_accents($title);

        if (function_exists('mb_strtolower') && seems_utf8($title)) {
                $title = mb_strtolower($title, 'UTF-8');
        } else {
                $title = strtolower($title);
        }

        $title = preg_replace('/&.+?;/', '', $title); // kill entities
        $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);

        $title = preg_replace('/[\s-]+/', '-', $title);
        $title = trim($title, '-');

        return $title;
}

function __enable_fix($post_name) {
        remove_filter('sanitize_title', 'sanitize_title_with_dashes');
        add_filter('sanitize_title', 'custom_sanitize_title_with_dashes');

        return $post_name;
}

add_filter('pre_post_name', '__enable_fix');
?>