php中将字符串转为HTML的实体引用的一个类

1. class HtmlEncode {  
2.         static $_convertToHtmlEntitiesSrcEncoding='UTF-8';  
3.  
4.         /** 
5.          * 将非ASCII字符串转换成HTML实体 
6.          * 
7.          * @example HtmlEncode::encode("我信了"); //输出:我信了 
8.          * @param string $s 要进行编码的字符串 
9.          * @return string 返回HTML实体引用 
10.          */  
11.         public static function encode($s,$srcEncoding='UTF-8') {  
12.             self::$_convertToHtmlEntitiesSrcEncoding=$srcEncoding;  
13.             return preg_replace_callback('|[^\x00-\x7F]+|',array(__CLASS__,'_convertToHtmlEntities'),$s);  
14.         }  
15.  
16.         public static function _convertToHtmlEntities($data) {  
17.             if (is_array($data)) {  
18.                 $chars=str_split(iconv(self::$_convertToHtmlEntitiesSrcEncoding,"UCS-2BE",$data[0]),2);  
19.                 $chars=array_map(array(__CLASS__,__FUNCTION__),$chars);  
20.                 return join("",$chars);  
21.             } else {  
22.                 $code=hexdec(sprintf("%02s%02s;",dechex(ord($data {0})),dechex(ord($data {1}))));  
23.                 return sprintf("&#%s;",$code);  
24.             }  
25.         }       
26.     }