PHP 会话变量不起作用 [英] PHP session variables wont work
问题描述
我是一名 PHP 学习者，我在使用 PHP 会话时遇到了一些问题.
I am a PHP learner, and I have got some problems with PHP sessions.
我正在尝试做一个简单的登录测试，但是当我定向到另一个页面时，会话变量似乎不会跟随.两个重要文件:
I am trying to do a simple login test, but it seems as session variables wont follow when I direct to another page. The two important files:
检查登录:
<html>
<head>
<title>
<?php
session_start();
?>
</title>
</head>
<body>
<?php
$connection = mysql_connect("localhost", "root", "root");
if(!connection)
{
die("could not connect to the database");
}
mysql_selectdb("phplogin", $connection) or die ("MySQL error i valg af database: " .mysql_error());
$query = "Select * from users where username='".$_POST['username']."' AND password = '".$_POST['userpass']."'";
$result = mysql_query($query);
$count = mysql_num_rows($result);
if($count==1){
$_SESSION['loggedIn'] = "true";
echo "The variable: ".$_SESSION['loggedIn'];
header("Location: loggedinPage.php");
exit;
}
if(!$count == 1){
header("Location:Login.php");
exit;
}
?>
</body>
和访问页面:
<html>
<head>
<title>
<?php
session_start();
?>
</title>
</head>
<body>
<?php
if($_SESSION['loggedIn'] != "true"){
echo "You are NOT logged in";
echo $_SESSION['loggedIn'];
exit;
}
echo $_SESSION['loggedIn'];
echo "You are logged in";
?>
</body>
即使您提供了正确的用户名和密码，当被定向到新页面时，它仍然表示您尚未登录.另一件事是标题(位置:等)"，这不起作用，我必须手动重定向.
Even though you give correct user and password, it still says that you are NOT logged in when directed to the new page. Another thing is the "header(Location: etc. etc)", this wont work, I have to redirect manually.
有什么帮助:)?- 大卫
Any help :)? - David
谢谢，我现在登录可以工作了，但是重定向仍然不起作用?我的文件现在看起来像这样:
Thanks, I got the logging in to work now, but the redirection still wont work? my file looks like this now:
<?php
session_start();
?>
<?php
$connection = mysql_connect("localhost", "root", "root");
if(!connection)
{
die();
}
mysql_selectdb("phplogin", $connection) or die ("MySQL error i valg af database: " .mysql_error());
$query = "Select * from users where username='".$_POST['username']."' AND password = '".$_POST['userpass']."'";
$result = mysql_query($query);
$count = mysql_num_rows($result);
if($count==1){
$_SESSION['loggedIn'] = "true";
header("Location: loggedinPage.php");
}
if(!$count == 1){
header("Location:Login.php");
}
?>
<head>
<title>
</title>
</head>
<body>
</body>
推荐答案
session_start() 应该在文档的最顶部，header() 应该只在在网站上发生任何输出之前执行.
session_start() should be at the very top of your document and header() should only be executed before any output has taken place on the website.
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