cookie
/*设置cookie(名称,数值,有效期,有效路径)*/
setcookie('test', time(),0,'/study');
/*删除cookie,数值置空,有效期设置为已过期*/
setcookie('test','',time()-1);
session
//开始使用session
session_start();
//设置一个session
$_SESSION['test'] = time();
//显示当前的session_id
echo "session_id:".session_id(); //session_id:oa2239migafvlfm3h0n6eo4vf7
//读取session值
echo $_SESSION['test'];
//销毁一个session
unset($_SESSION['test']);