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Home Backend Development PHP Tutorial 为什么反序列话没有输出?

为什么反序列话没有输出?

Jun 06, 2016 pm 08:09 PM
php

<code>$tmp = array("zh"=>"中文");
setcookie("zh",serialize($tmp));
$g = $_COOKIE["zh"];
echo unserialize($g);</code>
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请问下,为什么上述语句会没有输出,也就是说为什么反序列化会失败?

回复内容:

<code>$tmp = array("zh"=>"中文");
setcookie("zh",serialize($tmp));
$g = $_COOKIE["zh"];
echo unserialize($g);</code>
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Copy after login

请问下,为什么上述语句会没有输出,也就是说为什么反序列化会失败?

谢邀。
代码里有语法错误,unserialize反序列化之后是一个数组,而echo 数组只有语法错误的
Notice: Array to string conversion
你是不是修改了报错等级,把 notice 错误等级屏蔽了,所以没有输出任何对象。

至于 cookie 的运行等等,可以参考其他人的答案

echo unserialize($g)['zh'];

要么你dump(unserialize($g))

set_cookie发出响应浏览器才会有cookie,也就是说下次请求才会在$_COOKIE中看出来

反序列化没有失败,因为cookie是伴随着http请求头访问服务器的,当前设置的cookie值只能等到下次访问页面才能打印。所以你这样是无法打印出来的

$_COOKIE是在HTTP/HTTPS请求后才能获取到的,$_COOKIE["zh"]现在是空的,当然不会有内容了。

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