php实现HTML实体编号与非ASCII字符串相互转换类实

<?php
/
  HTML实体编号与非ASCII字符串相互转换类
  Date: 2016-09-07
  Author: fdipzone
  Ver: 1.0
 
  Func:
  public encode 字符串转为HTML实体编号
  public decode HTML实体编号转为字符串
  private _convertToHtmlEntities 转换为HTML实体编号处理
 /
class HtmlEntitie{ // class start

 public static $_encoding = 'UTF-8';

 /
   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
?>