PHP css_escape_string

css_escape_string.php

    //CSS escape code ripped from Zend Framework ( https://github.com/zendframework/zf2/blob/master/library/Zend/Escaper/Escaper.php )
        function css_escape_string($string)
        {
 $cssMatcher=function($matches)
  {
        $chr = $matches[0];
        if (strlen($chr) == 1) {
            $ord = ord($chr);
        } else {
            $chr = mb_convert_encoding($chr,'UTF-16BE','UTF-8');//$this->convertEncoding($chr, 'UTF-16BE', 'UTF-8');
            $ord = hexdec(bin2hex($chr));
        }
        return sprintf('\\%X ', $ord);
   };
        $originalEncoding=mb_detect_encoding($string);
        if($originalEncoding===false){$originalEncoding='UTF-8';};
        $string = mb_convert_encoding($string,'UTF-8',$originalEncoding);//$this->toUtf8($string);
//                throw new Exception('mb_convert_encoding(\''.$string.'\',\'UTF-8\',\''.$originalEncoding.'\');');
        if ($string === '' || ctype_digit($string)) {
            return $string;
        }
        $result = preg_replace_callback('/[^a-z0-9]/iSu', /*$this->*/$cssMatcher, $string);
                //var_dump($result);
        return mb_convert_encoding($result,$originalEncoding,'UTF-8');//$this->fromUtf8($result);
    }