Output Minification (Minifying html,css,js) CI 3.x

I have configured
$config['compress_output'] = TRUE;
but view page source remains unchanged,still spaces
Thanks for support
demo: http://hocphp.info/CodeIgniter-3.0.0/index.php/welcome

Try this to remove spaces, line-feeds, etc:

PHP Code:

//==============================================
function _maybe_compress_using_reference( & $result='', $return_result=false )
{
    $_SESSION['zzz_after']  = ''; // strlen($result);
    $_SESSION['zzz_before'] = strlen($result);
    $search = array(
        '/\>[^\S ]+/s',   // strip whitespaces after tags, except space
        '/[^\S ]+\</s',   // strip whitespaces before tags, except space
        '/(\s)+/s'        // shorten multiple whitespace sequences
        );
    $replace = array(
        '>',
        '<',
        '\\1'
        );
    $result = preg_replace($search, $replace, $result);
    // DOES NOT SHOW ADVERTS ?????
    // $hex=array("\x0D","\x0A");
    // $result=str_replace($hex,'',$result);

    $_SESSION['zzz_after'] = strlen($result);

    # Dab on end
    if(LOCALHOST): // DABS this on the end after </body></html>
      $result = str_replace("</body></html>",'', $result);

      $result .=  '<p class=\'clb\'> ONLY LOCALHOST <br /> Crunched output results:'
              .       jj.js .'Before: '      . number_format($_SESSION['zzz_before'])
              .       jj.js .'After: &nbsp; '. number_format($_SESSION['zzz_after'])
              .       jj.js .'Saving: '      . number_format($_SESSION['zzz_before'] - $_SESSION['zzz_after']) .' bytes'
              .       jj.js .'Percent: '     . number_format(100 * ($_SESSION['zzz_before'] - $_SESSION['zzz_after']) / $_SESSION['zzz_before']) .' %'
              .   '</p>'
              .   '</body></html>';
    endif;

  // RETURNED BY REFERENCE
  // return $result;
}//endfunc