問題描述

我有這個頁面，它設置了一個 cookie，如果你選中一個復選框，它會回顯一個字符串.字符串打印正確，但 cookie 從未設置，我不知道為什么.

I have this page that sets a cookie and echos out a string if you check a checkbox. The string prints correctly, but the cookie never gets set and I have no idea why.

<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post">
<label for="checkbox">Option 1:</label>
<input type="checkbox" name="checkbox" id="checkbox"><br>
<input type="submit" name="submit" value="Submit">
</form>
  <?php
if (isset($_POST['checkbox'])) {
  setcookie("cookie", "on", time()+3600*24);
  echo "You checked the checkbox and a cookie was set with a value of:<br>";
}
else {
  setcookie("cookie", "off", time()+3600*24);
  echo "You didn't check the checkbox and a cookie was set with a value of:<br>";
}
echo $_COOKIE['cookie'];
  ?>

有誰知道為什么上面的代碼不起作用?

Does anyone know why the above code does not work?

推薦答案

PHP 超全局變量在腳本啟動時填充，然后在腳本的整個生命周期內不再被 PHP 修改或觸及.這意味著 $_COOKIE 表示在啟動腳本的 http 請求中發送到服務器的 cookie.它不會顯示您在腳本生命周期中添加/更改/刪除的任何 cookie.這些更改只會顯示在 NEXT 請求中.

PHP superglobals are populated at script start-up time, and then are NOT modified or touched by PHP again for the life of the script. That means $_COOKIE represents the cookies that were sent to the server in the http request that fired up the script. It will NOT show any cookies you've added/changed/deleted during the life of the script. Those changes will only show up on the NEXT request.

唯一的例外是 $_SESSION，它在您調用 session_start() 時填充.

The only exception to this is $_SESSION, which is populated when you call session_start().

如果您需要立即將這些值添加到 $_COOKIE 中，則必須手動添加它們，例如

If you need those values to be in $_COOKIE immediately, you'll have to add them manually, e.g.

setcookie('cookie', $value, ....);
$_COOKIE['cookie'] = $value;

這篇關于PHP – setcookie() 不起作用的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！