php子域名共享session

参考网站：http://blog.sina.com.cn/s/blog_8533e27f01015nls.html

www 

session_set_cookie_params(time()+3600*24*365*10,"/",".perfectinter.net");
  session_start();
 setcookie("session_id",session_id(),time()+3600*24*365*10,"/",".perfectinter.net");
$_SESSOON['S']="";


IDS
   session_destroy();
   session_id($_COOKIE['session_id']);
   session_start();  
ECHO $_SESSOON['S'];