为什么不能从whatwg-fetch请求中设置PHP $ _SESSION? [英] Why can't I set PHP $_SESSION from a whatwg-fetch request?
问题描述
我有一个简单的提取请求，如下所示:
I have a simple fetch request that looks like this:
fetch('/includes/signon.php', {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify({
Email: event.target.form.email.value,
Password: event.target.form.password.value,
})
})
.then((response) => {
return response.text()
}).then((body) => {
this.displayWelcomeMessage(body);
})
在后端，我有PHP可以像这样处理提取请求:
And on the backend, I have PHP that handles the fetch request like so:
<?php
require_once('database.php');
session_start();
$request_body = file_get_contents('php://input');
$json = json_decode($request_body);
if (!empty($json->Email) && !empty($json->Password)) {
global $db, $json;
$sql = "SELECT `user_id` from users where email = ? AND password = ?;";
$stmt = $db->initialize_statement();
if (!$stmt->prepare($sql)) {
$error = $stmt->error;
echo $stmt->error;
} else {
$email = $json->Email;
$password = $json->Password; // Stored as a string for the sake of simplicity
$stmt->bind_param('ss', $email, $password);
$stmt->execute();
$stmt->store_result();
$stmt->bind_result($result);
while($stmt->fetch()) {
if ($stmt->num_rows === 0) {
echo "Incorrect Username or Password";
} else {
// Here lies the problem...
$_SESSION['user_id'] = $result;
echo "Welcome, User #".$result."!";
}
}
$stmt->close();
}
} else {
var_dump($_SESSION); // For debugging purposes only
}
现在，这是问题所在！响应的主体显示欢迎使用，用户#12！".当我以应有的方式登录时，但$_SESSION['user_id']设置为12却没有存储在实际会话中...
Now, here's the problem! The body of the response displays "Welcome, User #12!" when I log in like it should, but $_SESSION['user_id'] is set to 12 without being stored in the actual session...
如果我向该页面发出GET请求，则会将$_SESSION转储出去，而找不到$_SESSION['user_id'].
If I make a GET request to the page, it dumps the $_SESSION out and $_SESSION['user_id'] is nowhere to be found.
为什么?我究竟做错了什么?我只想完成这个项目...
Why? What am I doing wrong? I just want to finish this project...
更新:页面底部的var_dump($_SESSION);正在转储与我用于存储"user_id"的$_SESSION不同的会话.我想知道是什么原因造成的?为什么会转储与我要在其中存储变量的会话不同的会话?
UPDATE: The var_dump($_SESSION); at the bottom of the page is dumping a different session than the $_SESSION that I'm using to store "user_id". I wonder what is causing this? Why would it dump a different session than the one I'm storing variables in?
session_id():0q44kc1fkph8fkc8gt35gfabe6
session_id():a493j3v5vbnlon02s1s7bpkqj3
所以...每次设置"user_id"时，它都在创建一个新会话?为什么?
So... It's creating a new session every time I set "user_id"? Why?
推荐答案
问题很可能在于您为会话启用了cookie，并且cookie的生存期为0.例如，让我们尝试将其设置为7天在脚本的开头:
The issue most likely lies in the fact that you have cookies enabled for sessions, and the cookie lifetime is 0. For example, let's try making it 7 days instead at the beginning of your script:
ini_set('session.cookie_lifetime', 60 * 60 * 24 * 7);
如果这行得通，我建议将session.cookie_lifetime设置移到您的php.ini文件中，这样编写的每个脚本都不需要运行ini_set().
If this works, I would recommend moving the session.cookie_lifetime setting to your php.ini file so each script you write does not require running ini_set().
有关更多信息: https://stackoverflow.com/a/9797962/823549
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