Function bỏ dấu tiếng việt

    public static function clean_entities($fragment)
    {
        //$fragment = preg_replace(self::CLEAN_URL_REGEX, '-', strip_tags($fragment));
        //$fragment = trim(preg_replace('#-+#', '-', $fragment), '-');
$hacobi_filter_in = array (
'#(à|á|ạ|ả|ã|â|ầ|ấ|ậ|ẩ|ẫ|ă|ằ|ắ|ặ|ẳ|ẵ)#',
'#(è|é|ẹ|ẻ|ẽ|ê|ề|ế|ệ|ể|ễ)#',
'#(ì|í|ị|ỉ|ĩ)#',
'#(ò|ó|ọ|ỏ|õ|ô|ồ|ố|ộ|ổ|ỗ|ơ|ờ|ớ|ợ|ở|ỡ)#',
'#(ù|ú|ụ|ủ|ũ|ư|ừ|ứ|ự|ử|ữ)#',
'#(ỳ|ý|ỵ|ỷ|ỹ)#',
'#(đ)#',
'#(À|Á|Ạ|Ả|Ã|Â|Ầ|Ấ|Ậ|Ẩ|Ẫ|Ă|Ằ|Ắ|Ặ|Ẳ|Ẵ)#',
'#(È|É|Ẹ|Ẻ|Ẽ|Ê|Ề|Ế|Ệ|Ể|Ễ)#',
'#(Ì|Í|Ị|Ỉ|Ĩ)#',
'#(Ò|Ó|Ọ|Ỏ|Õ|Ô|Ồ|Ố|Ộ|Ổ|Ỗ|Ơ|Ờ|Ớ|Ợ|Ở|Ỡ)#',
'#(Ù|Ú|Ụ|Ủ|Ũ|Ư|Ừ|Ứ|Ự|Ử|Ữ)#',
'#(Ỳ|Ý|Ỵ|Ỷ|Ỹ)#',
'#(Đ)#',
"/[^a-zA-Z0-9\-\_]/",
) ;
$hacobi_filter_out = array (
'a',
'e',
'i',
'o',
'u',
'y',
'd',
'A',
'E',
'I',
'O',
'U',
'Y',
'D',
'-',
) ;
        $fragment = preg_replace(self::CLEAN_URL_REGEX, '-', strip_tags($fragment));
        $fragment = preg_replace($hacobi_filter_in, $hacobi_filter_out, $fragment);
        $fragment = preg_replace('/(-)+/', '-', $fragment);
        $fragment = trim(preg_replace('#-+#', '-', $fragment), '-');
        $fragment = str_replace('quot-','',$fragment);
        $fragment = $fragment.".html";
        return $fragment;
    }