PHP学习：php实现HTML实体编号与非ASCII字符串相互转换类实例

<?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
?>