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/**
* 去掉字符串中的空格
*
* @param string $content
* @param int    $len
* @param string $encode
* @param bool   $htmltags
*
* @return string 字符串
*/
public function mbStrReplace($content, $len = 0, $encode = 'utf-8', $htmltags = true) {
  $str = trim($content);
  if ($htmltags) {
  	$str = strip_tags($str);
  }
  $str = preg_replace('/[\n|\r|\t]+/', '', $str);
  $str = preg_replace("/(\s|\&nbsp\;|　|\xc2\xa0)/", '', $str);
  //借鉴：http://bbs.phpchina.com/thread-209008-1-1.html
  if ($len > 0)
  	return mb_substr($str, 0, $len, $encode);
  else {
  	return $str;
  }
 }