php实现HTML实体编号与非ASCII字符串相互转换类实例

/**

• 字符串转为HTML实体编号
• @param String $str 字符串
• @param String $encoding 编码
• @return String
  */
  public static function encode($str,$encoding='UTF-8'){
  self::$_encoding = $encoding;
  return preg_replace_callback('|[^x00-x7F]+|',array(CLASS,'_convertToHtmlEntities'),$str);
  }

/**

• HTML实体编号转为字符串
• @param String $str HTML实体编号字符串
• @param String $encoding 编码
• @return String
  */
  public static function decode($str,$encoding='UTF-8'){
  return html_entity_decode($str,null,$encoding);
  }

/**

• 转换为HTML实体编号处理
• @param Mixed $data 待处理的数据
• @param String
  */
  private static function _convertToHtmlEntities($data){
  if(is_array($data)){
  $chars = str_split(iconv(self::$_encoding,'UCS-2BE',$data[0]),2);
  $chars = array_map(array(CLASS,FUNCTION),$chars);
  return implode("",$chars);
  }else{
  $code = hexdec(sprintf("%02s%02s;",dechex(ord($data {0})),dechex(ord($data {1})) ));
  return sprintf("&#%s;",$code);
  }
  }

} // class end
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