public static function slugify($slug)
    {
        $slug = preg_replace('/\xE3\x80\x80/', ' ', $slug);
        $slug = str_replace('-', ' ', $slug);
        $slug = preg_replace('#[:\#\*"@+=;!><&\.%()\]\/\'\\\\|\[]#', "\x20", $slug);
        $slug = str_replace('?', '', $slug);
        $slug = trim(mb_strtolower($slug, 'UTF-8'));
        $slug = preg_replace('#\x20+#', '-', $slug);
        return $slug;
    }