Cakephp已经提供Cookie Component，我们可以直接调用方法。

方法有：

write：写入cookie

read：读取cookie中的内容

delete：删除cookie

destroy：销毁所有cookie

使用方法：

先引入cookie库

var $components = array (
'Cookie' => array (
"time" => "2 Days" 
));

写入cookie：$this->Cookie->write ("login_cookie",array("name"=>"name","password"=>"password"));
读取cookie：$cookie = $this->Cookie->read ("login_cookie");

删除cookie：$this->Cookie->delete("login_cookie");