在setcookie（）之后立即访问$ _COOKIE [英] Accessing $_COOKIE immediately after setcookie()

问题描述

我尝试在调用 setcookie（）后立即访问cookie的值（使用 $ _ COOKIE 函数在PHP。当我这样做， $ _ COOKIE ['uname'] 未设置。为什么？

I'm trying to access a cookie's value (using $_COOKIE) immediately after calling the setcookie() function in PHP. When I do so, $_COOKIE['uname'] isn't set. Why?

但是，请注意，下一次执行 $ _ COOKIE ['uname']

Note, however, that $_COOKIE['uname'] is set as expected upon the next execution of the script, such as after a page refresh.

setcookie('uname', $uname, time() + 60 * 30);
echo "Cookie value: " . $_COOKIE['uname'];

推荐答案

$ _ COOKIE 在网页加载时设置，因为网络的无状态性质。如果您想要立即访问，可以自己设置 $ _ COOKIE ['uname'] 。

$_COOKIE is set when the page loads, due to the stateless nature of the web. If you want immediate access, you can set $_COOKIE['uname'] yourself or use an intermediate variable.

例如：

if (isset($_COOKIE['uname'])) {
    // get data from cookie for local use
    $uname = $_COOKIE['uname'];
}
else {
    // set cookie, local $uname already set
    setcookie('uname', $uname, time() + 1800);  
}

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