PHP重定向无法成功登录
[英]PHP redirect not working on successful login
问题描述
I'm teaching myself PHP so this is probably something stupid I don't know yet, but why is my redirect not working... 
我正在自学PHP，这可能是我不知道的愚蠢之举，但是为什么我的重定向无法正常工作...
I'm trying to do this: 我正在尝试这样做：
header("Location: members.php?view=$user"); exit;
which doesn't do anything, but when I place a link in die statement upon successful login 这什么也没做，但是当我成功登录后在die语句中放置链接时
die("You are now logged in. Please <a href='members.php?view=$user'>click here</a> to continue.");
I can click on that link and it works fine. 我可以单击该链接，它可以正常工作。
Full Code 完整代码
<?php //login.php
include_once 'header.php';
echo "<div class='main'><h3>Please enter your details to log in</h3>";
$error = $user = $pass = "";
if (isset($_POST['user'])) {
$user = sanitizeString($_POST['user']);
$pass = sanitizeString($_POST['pass']);
if ($user == "" || $pass == "") {
$error = "Not all fields were entered<br />";
}
else {
$query = "SELECT user,pass FROM members WHERE user='$user' AND pass='$pass'";
if (mysql_num_rows(queryMysql($query)) == 0) {
$error = "<span class='error'>Username/Password invalid</span><br /><br />";
}
else {
$_SESSION['user'] = $user;
$_SESSION['pass'] = $pass;
header("Location: members.php?view=$user"); exit;
}
}
}
echo <<<_END
<form method='post' action='login.php'>$error
<span class='fieldname'>Username</span><input type='text' maxlength='16' name='user' value='$user' /><br />
<span class='fieldname'>Password</span><input type='password' maxlength='16' name='pass' value='$pass' />
_END;
?>
<br />
<span class='fieldname'> </span>
<input type='submit' value='Login' />
</form><br /></div></body></html>
<?php //header.php
session_start();
echo "<!DOCTYPE html>\n<html><head><script src='js/osc.js'></script>";
include 'functions.php';
$userstr = ' (Guest)';
if (isset($_SESSION['user'])) {
$user = $_SESSION['user'];
$loggedin = TRUE;
$userstr = " ($user)";
}
else {
$loggedin = FALSE;
}
echo "<title>$appname$userstr</title><link href='css/main.css' rel='stylesheet' type='text/css' />" .
"</head><body><div class='$appname'>$appname$userstr</div>";
if ($loggedin) {
echo "<br /><ul class='menu'>" .
"<li><a href='members.php?view=$user'>Home</a></li>" .
"<li><a href='members.php'>Members</a></li>" .
"<li><a href='friends.php'>Friends</a></li>" .
"<li><a href='messages.php'>Messages</a></li>" .
"<li><a href='profile'>Edit Profile</a></li>" .
"<li><a href='logout.php'>Log Out</a></li></ul><br />";
}
else {
echo ("<br /><ul class='menu'>" .
"<li><a href='index.php'>Home</a></li>" .
"<li><a href='signup.php'>Sign Up</a></li>" .
"<li><a href='login.php'>Log In</a></li></ul><br />" .
"<span class='info'>⇎ You must be logged in to view this page.</span><br /><br />"
);
}
?>
I've tried removing the first echo at the top, as well as the $error message. 我尝试过删除顶部的第一个echo以及$error消息。 Like I said, I'm trying to improve on some code I picked up from this O'Reilly book , so I appreciate any help, guidance, criticism, etc. 就像我说的那样，我正在尝试改进从这本O'Reilly书籍中获得的代码，因此，我感谢任何帮助，指导，批评等。
4 个解决方案
解决方案1
3 2014-03-24 19:37:21
Any output (echo) from the PHP script prior to setting the Location header will cause the redirection to fail. 在设置Location标头之前，PHP脚本的任何输出（回显）都将导致重定向失败。 In an ideal world, a script that redirects a user shouldn't really have a body, though many still do. 在理想的情况下，重定向用户的脚本实际上不应具有主体，尽管许多主体仍具有主体。
Remove any echo lines before you call Header. 在调用Header之前，请删除所有回声线。
解决方案2
1 2014-03-25 15:22:00
You have output before your redirect. 您在重定向之前已输出。 You can't redirect once output has been sent to the browser. 将输出发送到浏览器后，您将无法重定向。
echo "<div class='main'><h3>Please enter your details to log in</h3>";
Move this code block to after your redirect code. 将此代码块移动到重定向代码之后。
解决方案3
0 2014-03-24 19:56:55
您要么必须删除在标头函数之前生成任何html的代码，要么尝试将ob_start（）放在页面的开头（最好是第一行）。
解决方案4
-1 2014-03-25 15:09:46
As already said by Aeaex , the echo will make your header redirect fail. 正如Aeaex所说，回声将使标头重定向失败。 As an alternative to using a header redirect, you could echo this : 作为使用标头重定向的替代方法，您可以显示以下内容：
'<meta http-equiv="refresh" content="2;url=http://myurl.com">';
where the number 2 in the content is the amount of seconds before the redirect, set it to 0 if it needs to be done immediately. 其中内容中的数字2是重定向之前的秒数，如果需要立即完成，请将其设置为0。
This might be bad practice and break w3 validation though. 这可能是不好的做法，但会破坏w3验证。
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