PHP+JSON输出汉字

<?php 
function Notice(){
 include './include/conn.php'; //数据库链接文件
 $sql_notice = 
mysql_query
('SELECT * FROM gg_notice where enable = "1" limit 0,10');
 $notice = 
mysql_fetch_array
($sql_notice, MYSQL_ASSOC);
 $str = json_encode($notice);
 //linux
 return preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '\\1'))", $str);
 //windows
 //return preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2LE', 'UTF-8', pack('H4', '\\1'))", $str);
 
}
?>

 <?php
/*** json 生成,分析 支持中文
 */
class Json_Helper {
 /**
 * 生成json
 */
 public static function encode($str){
 $json = json_encode($str);
 //linux
 return preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2BE', 'UTF-8', pack('H4', '\\1'))", $json);
 //windows
 //return preg_replace("#\\\u([0-9a-f]{4})#ie", "iconv('UCS-2LE', 'UTF-8', pack('H4', '\\1'))", $json);
 }
 /**
 * 分析json
 */
 public static function decode($str) {
 return json_decode($str);
 }
}
?>