PHP将字符串转为HTML的实体引用（收集）
    class HtmlEncode { 
        static $_convertToHtmlEntitiesSrcEncoding='UTF-8'; 
     
        /**
         * 将非ASCII字符串转换成HTML实体
         *
         * @example HtmlEncode::encode("我信了"); //输出:我信了
         * @param string $s 要进行编码的字符串
         * @return string 返回HTML实体引用
         */ 
        public static function encode($s,$srcEncoding='UTF-8') { 
            self::$_convertToHtmlEntitiesSrcEncoding=$srcEncoding; 
            return preg_replace_callback('|[^\x00-\x7F]+|',array(__CLASS__,'_convertToHtmlEntities'),$s); 
        } 
     
        public static function _convertToHtmlEntities($data) { 
            if (is_array($data)) { 
                $chars=str_split(iconv(self::$_convertToHtmlEntitiesSrcEncoding,"UCS-2BE",$data[0]),2); 
                $chars=array_map(array(__CLASS__,__FUNCTION__),$chars); 
                return join("",$chars); 
            } else { 
                $code=hexdec(sprintf("%02s%02s;",dechex(ord($data {0})),dechex(ord($data {1})))); 
                return sprintf("&#%s;",$code); 
            } 
        } 
     
    }