更改SESSION变量值 [英] Change SESSION variable value

问题描述

我已经尝试了好一阵子了，这真让我发疯.基本上，我有一个针对美国和加拿大用户的表格.表单底部为加拿大用户提供了一个链接，该链接将用户定向到can-sesssion.php，其中包含:

I've been attempting to figure this out for a little while now, and it's driving me nuts. Basically I have a form for US and Canadian users. There's a link at the bottom of the form for Canadian users, which directs users to can-sesssion.php, which contains:

<?php
if (isset($_SESSION['can'])) {
    session_start();
    session_destroy();
    session_unset();
    session_start();
    $_SESSION['can'] = 2;
}
else {
    session_start();
    $_SESSION['can'] = 1;
}
header('Location: '. $_SERVER['HTTP_REFERER'] . '');
?>

基本上，如果他们单击链接，它会设置$ _SESSION ['can'] =1.现在还有另一个选择，如果他们单击该链接，它将带他们回到此页面，并且该会话应该被销毁并设置一个新值(嗯，这就是应该做的).问题是，我已经打印出$ _SESSION ['can']，并且在转到该页面后仍然保留了旧值.有没有更好的方法可以做到这一点，或者我的代码有问题吗?感谢您的帮助.

Basically, if they click on the link, it sets $_SESSION['can'] = 1. Now There's another option, and if they click that link, it takes them back to this page, and the session should be destroyed and a new value is set (well, that's what it's supposed to do). Problem is, I've printed out $_SESSION['can'], and it's still retaining that old value after going to that page. Is there a better way to do this, or is there something wrong w/ my code? Thanks for the help.

推荐答案

这是你写的:

if (isset($_SESSION['can'])) {
    session_start();

session_start是读取与用户PHPSESSID cookie相关联的会话文件并填充$_SESSION的函数，因此您尝试从数组中读取任何值之前.

session_start is the function which reads the session file associated with the user's PHPSESSID cookie and populates $_SESSION, so you're trying to read from the array before it has any values.

您需要先调用session_start ，然后再检查$_SESSION['can']是否具有值.

You need to call session_start before you check if $_SESSION['can'] has a value.

您也不需要销毁和创建新会话来更改值.

You also do not need to destroy and create a new session just to change a value.

<?php
session_start();
if (isset($_SESSION['can'])) {
    $_SESSION['can'] = 2;
} else {
    $_SESSION['can'] = 1;
}
header('Location: '. $_SERVER['HTTP_REFERER'] . '');
?>

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