$ _SESSION不跨PHP页面
[英]$_SESSION not carrying across php pages
问题描述
I am having a problem with the $_SESSION function in my php website. 
我的php网站中的$_SESSION函数有问题。 I set the function and then try to access it in another page, but it just comes up as blank. 我设置了功能，然后尝试在另一个页面中访问它，但是它只是空白。
This is the file login.php where I set the $_SESSION 这是我设置$_SESSION的文件login.php
<?php
session_start();
?>
<html>
<?php
$email = $_POST['email'];
$password = $_POST['password'];
$con = mysqli_connect("host","user","pass","db");
if (!$con)
{
die('Could not connect: ' . mysqli_error());
}
if ($email && $password){
$result = mysqli_query($con, "SELECT * FROM users WHERE email='$email'");
$numrows = mysqli_num_rows($result);
if ($numrows != 0){
//username exists
$row = mysqli_fetch_row($result);
if ($password != $row[2]){
print 'Incorrect password<br />';
$error = TRUE;
}
else {
//password is correct
echo "You're in! <a href='member.php'>Click</a> here to enter member page";
$_SESSION['email'] = $email;
}
}
else {
//email not found
print 'Sorry, that email cannot be found.<br />';
$error = TRUE;
}
}
else {
die('Please enter an email and password<br />');
$error = TRUE;
}
if ($error){
print '<a href=index.php>Go Back</a>';
}
?>
</html>
And this is the member.php file. 这是member.php文件。
<?php
session_start();
if (isset($_SESSION['email'])){
$username = $_SESSION['email'];
echo "Your email is ";
echo $username;
}
?>
When I press the link to go the the member.php page via the link, the page is completely blank, presumably suggesting that the $_SESSION['email'] has nothing in it. 当我按下链接以通过链接转到member.php页面时，该页面完全空白，可能表明$_SESSION['email']中没有任何内容。
Please let me know where I am going wrong, and how to rectify the issue. 请让我知道我要去哪里错了，以及如何解决此问题。
Any help would be much appreciated. 任何帮助将非常感激。
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3 个解决方案
解决方案1
1 2014-03-17 18:53:31
您需要在login.php的最顶部而不是中途进行此调用。
session_start();
解决方案2
1 已采纳 2014-03-17 18:53:47
Add session_start(); 添加session_start（）; before the HTML in login.php to set it 在login.php中的HTML之前进行设置
解决方案3
1 2014-03-17 18:57:36
Add this to the very top of the login.php page: 将其添加到login.php页面的最顶部：
<?php
session_start ();
?>
From the PHP documentation: 从PHP文档中：
"Note: To use cookie-based sessions, session_start() must be called before outputing anything to the browser." “注意：要使用基于cookie的会话，必须在输出任何内容到浏览器之前调用session_start（）。”
http://us3.php.net/session_start http://us3.php.net/session_start
If that still doesn't work edit this line: 如果仍然无法编辑此行：
echo "You're in! <a href='member.php'>Click</a> here to enter member page";
to be like this instead: 改为这样：
echo "You're in! <a href='member.php?" . htmlspecialchars(SID) . "'>Click</a> here to enter member page";
http://us3.php.net/manual/en/session.idpassing.php http://us3.php.net/manual/zh/session.idpassing.php
Z ž
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