成功登录后如何重定向？ [PHP]
[英]How to redirect after successful login? [PHP]
问题描述
I've created a login system. 
我已经创建了一个登录系统。 The registration page works like a charm. 注册页面的工作原理很像。 But there's some problem with the login page. 但是登录页面存在一些问题。 When I try to login, it logs me in, but it stays on the same login page. 当我尝试登录时，它会登录我，但仍保留在同一登录页面上。 I mean there is no visible change in the login page even after logging in. I want it to redirect after a successful login, I've tried headers but for some strange reason it didnt work. 我的意思是即使登录后登录页面也没有可见的变化。我希望登录成功后进行重定向，我尝试过标题，但出于某些奇怪的原因，它没有用。
My code (PHP in the page): 我的代码（页面中的PHP）：
<?php //Start the Session
session_start();
require('connect.php');
//3. If the form is submitted or not.
//3.1 If the form is submitted
if (isset($_POST['username']) and isset($_POST['password'])){
//3.1.1 Assigning posted values to variables.
$username = $_POST['username'];
$password = $_POST['password'];
//3.1.2 Checking the values are existing in the database or not
$query = "SELECT * FROM `user` WHERE username='$username' and password='$password'";
$result = mysql_query($query) or die(mysql_error());
$count = mysql_num_rows($result);
//3.1.2 If the posted values are equal to the database values, then session will be created for the user.
if ($count == 1){
$_SESSION['username'] = $username;
header("location:redirectafterlogin.php"); //header to redirect, but doesnt work
}else{
//3.1.3 If the login credentials doesn't match, he will be shown with an error message.
echo "Invalid Login Credentials.";
}
}
?>
HTML in the page: 页面中的HTML：
<title> Login</title>
<link rel="stylesheet" type="text/css" href="usr_style.css" />
</head>
<body>
<!-- Form for logging in the users -->
<div class="register-form">
<p>Please login to continue</p>
<h1>Login</h1>
<form action="login.php" method="POST">
<p><label>User Name : </label>
<input id="username" type="text" name="username" required placeholder="username" /></p>
<p><label>Password : </label>
<input id="password" type="password" name="password" required placeholder="password" /></p>
<a class="btn" href="register.php">Register</a>
<input class="btn" type="submit" name="submit" value="Login" />
</form>
</div>
</body>
</html>
What am I doing wrong? 我究竟做错了什么？
EDIT: 编辑：
Redirectafterlogin.php code (Its basically a guestbook): Redirectafterlogin.php代码（基本上是留言簿）：
<body>
<div class="main">
<br>
<div id="title"><h2>Post</h2></div>
<br>
<div id="f">
<form id="form1" name="form1" method="post" action="addpost.php">
<table id="g">
<td>Post</td>
<td><textarea name="comment" placeholder="Please type your post here...." rows=10 cols=50 id="comment"></textarea></td>
</tr>
<tr>
<td> </td>
<td><input id="btn" type="submit" name="Submit" value="Post" /> <input id="btn" type="reset" name="Submit2" value="Reset" /></td>
</tr>
</table>
</form>
</div>
<hr>
<?php
$host=""; // Host name
$username=""; // Mysql username
$password=""; // Mysql password
$db_name=""; // Database name
$tbl_name=""; // Table name
// Connect to server and select database.
mysql_connect("$host", "$username", "$password")or die("cannot connect server ");
mysql_select_db("$db_name")or die("cannot select DB");
$sql="SELECT * FROM $tbl_name ORDER BY ID DESC LIMIT 50";
$result=mysql_query($sql);
while($rows=mysql_fetch_array($result)){
?>
<div id="post_info">
<br>
<div id="author">
Name:
<?php echo htmlspecialchars($rows['name']); ?>
</div>
<div id="time">
Time: <?php echo htmlspecialchars($rows['datetime']); ?>
</div>
<br>
<div id="post">
<pre><?php echo htmlspecialchars($rows['comment']); ?></pre>
</div>
</div>
<br>
<?php
}
mysql_close(); //close database
?>
Error: 错误：
Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /customers/7/e/5/sattapesatta.com/httpd.www/login.php:5) in /customers/7/e/5/sattapesatta.com/httpd.www/login.php on line 6 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /customers/7/e/5/sattapesatta.com/httpd.www/login.php:5) in /customers/7/e/5/sattapesatta.com/httpd.www/login.php on line 6 1 Warning: Cannot modify header information - headers already sent by (output started at /customers/7/e/5/sattapesatta.com/httpd.www/login.php:5) in /customers/7/e/5/sattapesatta.com/httpd.www/login.php on line 20
4 个解决方案
解决方案1
1 2014-06-29 14:32:08
When you want to do a redirection with the function header, you have to write it properly for it to work. 当您想使用函数头进行重定向时，必须正确编写它才能起作用。
header('Location: ...');
If you don't use the capital letter and the space after the colon, it will not work. 如果您不使用大写字母和冒号后的空格，则它将不起作用。 Please read the manual on php.net . 请阅读php.net上的手册。
(Edit) （编辑）
I also saw in the comments to try to add the complete path, this is not necessary to make it work. 我还在注释中看到尝试添加完整的路径，这不是使其正常工作所必需的。
解决方案2
1 2014-06-29 17:37:57
Try this 尝试这个
header("Location: redirectafterlogin.php");
exit;
Also from the PHP docs 同样来自PHP文档
Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.
http://www.php.net/manual/en/function.header.php http://www.php.net/manual/zh/function.header.php
解决方案3
0 2015-04-22 15:08:48
The Most easy way: 最简单的方法：
Put this before any html in your page (not even a single space should be before this code)
<? php ob_start(); ?>在你的页面的任何HTML之前将这个（甚至不是一个单一的空间应该是这样的代码之前） <? php ob_start(); ?><? php ob_start(); ?>Use this -It's case sensitive-
<?php header("Location: youraddress.html");?>使用它-区分大小写- <?php header("Location: youraddress.html");?>- Close it when you finish
<?php ob_end_flush(); ?>完成<?php ob_end_flush(); ?>时将其关闭<?php ob_end_flush(); ?><?php ob_end_flush(); ?>
解决方案4
-1 2014-06-29 14:27:34
Remove white spaces and newlines before header: 删除标题前的空白和换行符：
session_start();
require('connect.php');
This should be: 应该是：
session_start();
require('connect.php'); // whitespace removed
And your: 和你的：
$query = "SELECT * FROM `user` WHERE username='$username' and password='$password'";
$result = mysql_query($query) or die(mysql_error());
Should be just: 应该只是：
$query = "SELECT * FROM `user` WHERE username='$username' and password='$password'";
$result = mysql_query($query) or die(mysql_error());
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