我正在关注this视频教程，并且在登录页面将用户从home.php重定向到index.php的部分遇到了麻烦。当用户单击登录时，将检查凭据，并在调用head函数时弹出此错误：
＆＃34;警告：无法修改标头信息 - 已发送的标头 （输出始于 /home/urbanas8/public_html/register/index.php:19299)in 第22行＆＃34; /home/urbanas8/public_html/register/inc/header.inc.php;
第19299行只是
<?php require_once("./inc/header.inc.php");?>
和第22行是
header("location: home.php");
这是header.inc.php文件：
<?php
session_start();
ini_set('display_errors', 1);
error_reporting(E_ALL);
require_once( "./inc/connect.inc.php" );
if(isset($_POST['login'])){
$user_login = strip_tags(@$_POST['user_login']);
$password_login = strip_tags(@$_POST['login_password']);
$password_login = md5($password_login);
$sql = mysql_query("SELECT id FROM users WHERE email='$user_login' AND password='$password_login' LIMIT 1");
$userCount = mysql_num_rows($sql);
if($userCount == 1){
while($row = mysql_fetch_array($sql)){
$id = $row["id"];
}
//echo("pass");
//$_SESSION['user_login'] = $user_login;
header("location: home.php");
exit();
}else {
echo("/invalid username/password");
exit();
}
}
?>
<div id="top-bar">
<div class="container">
<div class="row">
<div class="col-sm-12">
<ul id="top-info">
<li>Phone: 703-518-4325</li>
<li>Email: <a href="mailto:info@urbanare.com">info@urbanare.com</a></li>
</ul>
<ul class="nav pull-right" id="top-buttons" style="line-height:10px !important;">
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown"><i class="fa fa-sign-in"></i>Log in<strong class="caret"></strong></a></a>
<ul id="login-dp" class="dropdown-menu" style="padding: 15px;">
<form action="" method="POST" accept-charset="UTF-8">
email: <input id="user_username" style="margin-bottom: 15px;" type="text" name="user_login" size="30" />
password: <input id="user_password" style="margin-bottom: 15px;" type="password" name="login_password" size="30" />
<input id="user_remember_me" style="float: left; margin-right: 10px;" type="checkbox" name="remember" value="1" />
<label class="string optional" for="user_remember_me"> Remember me</label>
<input class="btn btn-primary" style="clear: left; width: 100%; height: 32px; font-size: 13px;" type="submit" name="login" value="Sign In" />
</form>
</ul>
</li>
<li class="divider"></li>
<li><a href="../register"><i class="fa fa-pencil-square-o"></i> Register</a></li>
</ul>
</div>
</div>
</div>
</div>
<div class="sticky-wrapper"><div id="nav-section">
<div class="container">
<div class="row">
<div class="col-sm-12">
<a href="http://comingsoon.safepropserv.com/landing/index.html" class="nav-logo"><img src="./files/logo_transparent.png" alt="UrbanaRE Logo"></a>
<!-- BEGIN SEARCH -->
<div id="sb-search" class="sb-search">
<form>
<input class="sb-search-input" placeholder="Search..." type="text" value="" name="search" id="search">
<input class="sb-search-submit" type="submit" value="">
<i class="fa fa-search sb-icon-search"></i>
</form>
</div>
<!-- END SEARCH -->
<!-- BEGIN MAIN MENU -->
<nav class="navbar">
<button id="nav-mobile-btn"><i class="fa fa-bars"></i></button>
<ul class="nav navbar-nav">
<li class="dropdown">
<a href="./files/UrbanaRE -- Property Info.html" data-toggle="dropdown" data-hover="dropdown">Home<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="http://comingsoon.safepropserv.com/landing/index.html">Home Search</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/index-slider.html">Home Slider</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/index-grid.html">Home Grid</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/index-map.html">Home Map</a></li>
</ul>
</li>
<li class="dropdown">
<a href="./files/UrbanaRE -- Property Info.html" data-toggle="dropdown" data-hover="dropdown">Properties<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="http://comingsoon.safepropserv.com/landing/properties-detail.html">Properties Detail</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/properties-list.html">Properties List</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/properties-grid.html">Properties Grid</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/properties-grid2.html">Properties Grid 2</a></li>
</ul>
</li>
<li class="dropdown">
<a class="dropdown" href="./files/UrbanaRE -- Property Info.html" data-toggle="dropdown" data-hover="dropdown">Pages<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="http://comingsoon.safepropserv.com/landing/about.html">About Us</a></li>
<li class="dropdown-submenu">
<a href="./filse/UrbanaRE -- Property Info.html">Agency</a>
<ul class="dropdown-menu">
<li><a href="http://comingsoon.safepropserv.com/landing/agency-detail.html">Agency Detail</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/agency-listing.html">Agency Listing</a></li>
</ul>
</li>
<li class="dropdown-submenu">
<a href="./files/UrbanaRE -- Property Info.html">Agent</a>
<ul class="dropdown-menu">
<li><a href="http://comingsoon.safepropserv.com/landing/agent-detail.html">Agent Detail</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/agent-listing.html">Agent Listing</a></li>
</ul>
</li>
<li><a href="http://comingsoon.safepropserv.com/landing/pricing-tables.html">Pricing Tables</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/login.html">Login</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/register.html">Register</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/faq.html">FAQ</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/404.html">404</a></li>
<li class="divider"></li>
<li><a tabindex="-1" href="./files/UrbanaRE -- Property Info.html"> Separated link </a></li>
</ul>
</li>
<li class="dropdown">
<a href="./files/UrbanaRE -- Property Info.html" data-toggle="dropdown" data-hover="dropdown">Blog<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="http://comingsoon.safepropserv.com/landing/blog-detail.html">Blog Detail</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/blog-listing1.html">Blog Listing 1</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/blog-listing2.html">Blog Listing 2</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/blog-listing3.html">Blog Listing 3</a></li>
<li><a href="http://comingsoon.safepropserv.com/landing/blog-listing4.html">Blog Listing 4</a></li>
</ul>
</li>
<li><a href="http://comingsoon.safepropserv.com/landing/contacts.html">Contacts</a></li>
</ul>
</nav>
<!-- END MAIN MENU -->
</div>
</div>
</div>
</div></div>
<!-- END HEADER -->
答案 0 :(得分：1)
根据您分享的错误消息。
输出在＆＃34; index.php：19299＆＃34; （在包括header.inc.php之前）
如果你没有任何空格（在ob_start（）之前;在index.php文件的第一行。
<?php ob_start();
答案 1 :(得分：1)
您应该尝试在以下行注释：
// ini_set('display_errors', 1);
// error_reporting(E_ALL);
或者您应该检查标题中是否应该回显。因为在标题重定向之前回显某些内容时，通常会发生此错误。
答案 2 :(得分：0)
删除了session_start（）;从标题中将其放在索引文件的顶部... 3小时后。