//存如cookie值
_userid 变量名
$userid 变量值
$cookietime cookie失效时间
param::set_cookie('_userid', 1, 3600);
param::set_cookie('_username', admin, 3600);
//取cookie值
var_dump(param::get_cookie('_userid')); //打印为1
var_dump(param::get_cookie('_username')); //打印为admin
//注销此变量
param::set_cookie('_userid','');
param::set_cookie('_username','');