我在尝试对我网站的某个部分进行密码保护时遇到了困难。我对 php 不太熟悉，所以我使用来自 zubrag.com 的代码作为起点。我遇到的问题是当前代码出现错误，指出：
cannot modify header information - headers already sent by (output started at /var/www/index.php:78) in /var/www/index.php on line 333
我看过 78，我明白了，我的输出从那里开始，因为那是 php 括号所在的第一行。
第 333 行是我的setcookie命令。我也明白，为了设置 cookie，需要在标题中完成。不幸的是，我不确定如何用我的代码做到这一点。我在网上查看过，发现通常解决此问题的最佳方法是使用ob_start()and ob_end_flush()。好吧，我尝试将这些命令放在很多地方，但到目前为止还没有运气。
我已经ob_start在文件的开头设置了，在其他所有内容之前。我也在案件开始时尝试过，但没有运气。
我已经ob_end_flush在文件末尾和案例末尾设置了，我也没有运气。
<html lang="en">
<head>
<title>DVR Controls</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<link rel="stylesheet" type="text/css" href="css/superfish.css">
<link rel="stylesheet" media="screen" href="css/superfish-navbar.css" />
<script type="text/javascript" src="js/jquery-1.2.6.min.js"></script>
<script type="text/javascript" src="js/hoverIntent.js"></script>
<script type="text/javascript" src="js/superfish.js"></script>
<script type="text/javascript">
// initialise plugins
jQuery(function(){
jQuery('ul.sf-menu').superfish();
});
</script>
<script>
$(document).ready(function(){
$("ul.sf-menu").superfish({
pathClass: 'current'
});
});
</script>
<center><b><font size="36">The Radeus DVR Prototype</font></b></center>
</head>
<body>
<ul class="sf-menu sf-navbar">
<li class="current">
<a>Configuration</a>
<ul>
<li>
<a href="index.php?page=SysConfig">System Configuration</a>
</li>
<li>
<a href="index.php?page=FileConfig">File Configuration</a>
</li>
<li>
<a href="index.php?page=NetworkConfig">Network Configuration</a>
</li>
</ul>
</li>
<li>
<a href="index.php?page=Files">Files</a>
</li>
<li>
<a href="index.php?page=Maintenance">Maintenance Mode</a>
</li>
<li>
<a href="index.php?page=IETM">IETM</a>
</li>
<li>
<a>Power Options</a>
<ul>
<li>
<a href="index.php?page=Shutdown">Shutdown</a>
</li>
<li>
<a href="index.php?page=Reboot">Reboot</a>
</li>
</ul>
</li>
</ul>
</body>
<br><br><br><br><br>
<body>
<br>
<?php
ob_start();
$currentdir = '/data/'; //Location of Hard Drive
/**
* @func: Executes the command passed to it as argument and prints the
* command console output line by line onto the html output stream hence
* giving the illusion of having the command executing in the html window itself.
*/
function html_exec_cmd($cmd) {
$proc = popen("($cmd)2>&1", "r");
echo '<pre>';
while(!feof($proc)) {
$result = fgets($proc, 100);
echo htmlspecialchars($result);
flush();
}
pclose($proc);
echo '</pre>';
}
switch ($_GET['page'])
{
case 'SysConfig':
echo "Welcome to System Config!";
break;
case 'FileConfig':
echo "Welcome to File Config!";
break;
case 'NetworkConfig':
?>
<b><fontsize="16">Current Settings:</b></font>
<?php
html_exec_cmd('ifconfig eth0');
break;
case 'Files':
$FileCount = 0;
$dir = opendir($currentdir);
$array = array();
echo '<ul>';
echo '<form method = "post" action = "">';
while ($File = readdir($dir)){
echo '<form action="test.php" method = "post">';
//if (is_file($file))
$ext = pathinfo($File, PATHINFO_EXTENSION);
if ($ext == '264'){
$array[] = "$File";
echo "<INPUT class='radio' type='radio' name='FileName' value='$File' /> <span>$File</span><p>";
$FileCount++;
}
}
echo "<INPUT TYPE = 'Submit' name = 'FormSubmit' value = 'Submit'>";
echo '</form>';
if ($_POST['FormSubmit'] == "Submit")
{
$FileParameters = $_POST['FileName'];
$FileExecuteCommand = "cd //; /etc/init.d/matrix-gui-e stop;echo 0 > /sys/devices/platform/vpss/graphics0/enabled;./usr/share/ti/ti-omx/ decode_display_a8host_debug.xv5T -w 1920 -h 1080 -f 60 -c h264 -g 0 -d 0 -i $currentdir$FileParameters;/etc/init.d/matrix-gui-e start";
echo exec($FileExecuteCommand);
}
break;
case 'Maintenance':
###############################################################
# Page Password Protect 2.13
###############################################################
# Visit http://www.zubrag.com/scripts/ for updates
###############################################################
#
# Usage:
# Set usernames / passwords below between SETTINGS START and SETTINGS END.
# Open it in browser with "help" parameter to get the code
# to add to all files being protected.
# Example: password_protect.php?help
# Include protection string which it gave you into every file that needs to be protected
#
# Add following HTML code to your page where you want to have logout link
# <a href="http://www.example.com/path/to/protected/page.php?logout=1">Logout</a>
#
###############################################################
/*
-------------------------------------------------------------------
SAMPLE if you only want to request login and password on login form.
Each row represents different user.
$LOGIN_INFORMATION = array(
'zubrag' => 'root',
'test' => 'testpass',
'admin' => 'passwd'
);
--------------------------------------------------------------------
SAMPLE if you only want to request only password on login form.
Note: only passwords are listed
$LOGIN_INFORMATION = array(
'root',
'testpass',
'passwd'
);
--------------------------------------------------------------------
*/
##################################################################
# SETTINGS START
##################################################################
// Add login/password pairs below, like described above
// NOTE: all rows except last must have comma "," at the end of line
$LOGIN_INFORMATION = array(
'admin' => 'adminpass'
);
// request login? true - show login and password boxes, false - password box only
define('USE_USERNAME', true);
// User will be redirected to this page after logout
define('LOGOUT_URL', 'http://www.example.com/');
// time out after NN minutes of inactivity. Set to 0 to not timeout
define('TIMEOUT_MINUTES', 3);
// This parameter is only useful when TIMEOUT_MINUTES is not zero
// true - timeout time from last activity, false - timeout time from login
define('TIMEOUT_CHECK_ACTIVITY', true);
##################################################################
# SETTINGS END
##################################################################
///////////////////////////////////////////////////////
// do not change code below
///////////////////////////////////////////////////////
// show usage example
if(isset($_GET['help'])) {
die('Include following code into every page you would like to protect, at the very beginning (first line):<br><?php include("' . str_replace('\\','\\\\',__FILE__) . '"); ?>');
}
// timeout in seconds
$timeout = (TIMEOUT_MINUTES == 0 ? 0 : time() + TIMEOUT_MINUTES * 60);
// logout?
if(isset($_GET['logout'])) {
setcookie("verify", '', $timeout, '/'); // clear password;
header('Location: ' . LOGOUT_URL);
exit();
}
if(!function_exists('showLoginPasswordProtect')) {
// show login form
function showLoginPasswordProtect($error_msg) {
?>
<html>
<head>
<title>Please enter password to access this page</title>
<META HTTP-EQUIV="CACHE-CONTROL" CONTENT="NO-CACHE">
<META HTTP-EQUIV="PRAGMA" CONTENT="NO-CACHE">
</head>
<body>
<style>
input { border: 1px solid black; }
</style>
<div style="width:500px; margin-left:auto; margin-right:auto; text-align:center">
<form method="post">
<h3>Please enter password to access this page</h3>
<font color="red"><?php echo $error_msg; ?></font><br />
<?php if (USE_USERNAME) echo 'Login:<br /><input type="input" name="access_login" /><br />Password:<br />'; ?>
<input type="password" name="access_password" /><p></p><input type="submit" name="Submit" value="Submit" />
</form>
<br />
</div>
</body>
</html>
<?php
// stop at this point
die();
}
}
// user provided password
if (isset($_POST['access_password'])) {
$login = isset($_POST['access_login']) ? $_POST['access_login'] : '';
$pass = $_POST['access_password'];
if (!USE_USERNAME && !in_array($pass, $LOGIN_INFORMATION)
|| (USE_USERNAME && ( !array_key_exists($login, $LOGIN_INFORMATION) || $LOGIN_INFORMATION[$login] != $pass ) )
) {
showLoginPasswordProtect("Incorrect password.");
}
else {
// set cookie if password was validated
setcookie("verify", md5($login.'%'.$pass), $timeout, '/');
// Some programs (like Form1 Bilder) check $_POST array to see if parameters passed
// So need to clear password protector variables
unset($_POST['access_login']);
unset($_POST['access_password']);
unset($_POST['Submit']);
}
}
else {
// check if password cookie is set
if (!isset($_COOKIE['verify'])) {
showLoginPasswordProtect("");
}
// check if cookie is good
$found = false;
foreach($LOGIN_INFORMATION as $key=>$val) {
$lp = (USE_USERNAME ? $key : '') .'%'.$val;
if ($_COOKIE['verify'] == md5($lp)) {
$found = true;
// prolong timeout
if (TIMEOUT_CHECK_ACTIVITY) {
setcookie("verify", md5($lp), $timeout, '/');
}
break;
}
}
if (!$found) {
showLoginPasswordProtect("");
}
}
?>
<B><fontsize=16>Are you sure you want to Format the data disk?</b></font><br><br>
<?php
echo '<form method = "post">';
echo "<INPUT TYPE = 'Submit' name = 'FormatSubmit' value = 'Submit'>";
?>
<br><br><br>
Please check the box to verify you want to Format the data disk.
<Input type = 'Checkbox' Name ='FormatCheck' value ="checked">
<?php
echo '</form>';
if (($_POST['FormatSubmit'] == "Submit") & ($_POST['FormatCheck'] == "checked"))
{
html_exec_cmd('echo -e "o\nn\np\n1\n\n\nw\n" | fdisk /dev/sda;sleep 1;mkfs.ext3 /dev/sda1;mount /dev/sda1 /data/');
}
ob_end_flush();
break;
case 'IETM':
echo "Welcome to IETM";
break;
case 'Shutdown':
//echo "Welcome to Shutdown";
?>
<B><fontsize=16>Are you sure you want to shutdown the DVR?</b></font><br><br>
<?php
echo '<form method = "post">';
echo "<INPUT TYPE = 'Submit' name = 'ShutDownSubmit' value = 'Submit'>";
?>
<br><br><br>
Please check the box to verify you want to shutdown the DVR.
<Input type = 'Checkbox' Name ='ShutDownCheck' value ="checked">
<?php
echo '</form>';
if (($_POST['ShutDownSubmit'] == "Submit") & ($_POST['ShutDownCheck'] == "checked"))
{
$ShutDownCommand = "init 0";
echo exec($ShutDownCommand);
}
break;
case 'Reboot':
//echo "Welcome to Reboot";
?>
<B><fontsize=16>Are you sure you want to reboot the DVR?</b></font><br>
<br>
<?php
echo '<form method = "post">';
echo "<INPUT TYPE = 'Submit' name = 'RebootSubmit' value = 'Submit'>";
?>
<br><br><br>
Please check the box to verify you want to reboot the DVR.
<Input type = 'Checkbox' Name ='RebootCheck' value ="checked">
<?php
if (($_POST['RebootSubmit'] == "Submit")& ($_POST['RebootCheck'] == "checked"))
{
$RebootCommand = "reboot";
echo exec($RebootCommand);
}
echo '</form>';
break;
default :
echo "The Radeus DVR";
}
?>
</body>
</html>
<?php ob_end_flush(); ?>