PHP cookie读取报错,上代码


<?php


 setcookie('name',234,time()+10,'/');


//$b = $_COOKIE['name'];

echo $_COOKIE['name'];

为什么这个代码,第一次执行的时候报错,会报
Notice: Undefined index: name in D:\wamp\Apache\htdocs\test.php on line 10
未定义的索引 name ,我明明是先设置了COOKIE 再读取的啊?求详细解释

php php-记住密码-cookie thinkphp cookie cookies

psy3ga 10 years ago

 Once the cookies have been set, they can be accessed on the next page load with the $_COOKIE or $HTTP_COOKIE_VARS

php对setcookie函数的说明。

Sam.com answered 10 years ago

cookie 设置不是立即生效的, setcookie() 只是在 response header 头里加上 Set-Cookie 头,例如:


 Set-Cookie: PHPSESSID=tbmh6ussjmqrblhth75qb9h2l0; path=/

这个响应到达客户端, Cookie 设置成功后, 下次 客户端的请求就会在 Header 里带上这个头:


 Cookie: PHPSESSID=tbmh6ussjmqrblhth75qb9h2l0

此时才能通过 $_COOKIE 取到这个值。这就是为什么:


 they can be accessed on the next page load with the $_COOKIE or $HTTP_COOKIE_VARS

almosty answered 10 years ago

Your Answer