http://blog.csdn.net/zhan198271/archive/2010/10/06/5923839.aspx

http://www.cnblogs.com/Anima0My/archive/2008/04/05/1136854.html

function PutCookie($key,$value,$kptime=0,$pa="/")
{
 global $cfg_cookie_encode;
 setcookie($key,$value,time()+$kptime,$pa);

 setcookie($key.'__ckMd5',substr(md5($cfg_cookie_encode.$value),0,16),time()+$kptime,$pa);
}

function DropCookie($key)
{
 setcookie($key,'',time()-360000,"/");
 setcookie($key.'__ckMd5','',time()-360000,"/");
}

function GetCookie($key)
{
 global $cfg_cookie_encode;
 if( !isset($_COOKIE[$key]) || !isset($_COOKIE[$key.'__ckMd5']) )
 {
  return '';
 }
 else
 {
  if($_COOKIE[$key.'__ckMd5']!=substr(md5($cfg_cookie_encode.$_COOKIE[$key]),0,16))
  {
   return '';
  }
  else
  {
   return $_COOKIE[$key];
  }
 }
}

cookie加密密码DwGBc2933O，
function GetCookie($key)
{
 global $cfg_cookie_encode;
 if( !isset($_COOKIE[$key]) || !isset($_COOKIE[$key.'__ckMd5']) )
 {
  return '';
 }
 else
 {
  if($_COOKIE[$key.'__ckMd5']!=substr(md5($cfg_cookie_encode.$_COOKIE[$key]),0,16))
  {
   return '';
  }
  else
  {
   return $_COOKIE[$key];
  }
 }
setcookie($key,$value,time()+$kptime,$pa);

setcookie($key.'__ckMd5',substr(md5($cfg_cookie_encode.$value),0,16),time()+$kptime,$pa);

PutCookie('DedeUserID',$uid,$this->M_KeepTime);
PutCookie('DedeLoginTime',$this->M_LoginTime,$this->M_KeepTime);
}

PutCookie('DedeUserID',$uid,$this->M_KeepTime);
   PutCookie('DedeLoginTime',$this->M_LoginTime,$this->M_KeepTime);

setcookie($key,$value,time()+$kptime,$pa);

 setcookie($key.'__ckMd5',substr(md5($cfg_cookie_encode.$value),0,16),time()+$kptime,$pa);