Question

以下错误不断出现，我不确定问题是什么，它说输出已经发送：

警告：无法修改标题信息 - 已在/ home / unix / student12 / w1376540 / public_html / messages中发送的标题（在/home/unix/student12/w1376540/public_html/messages/title_bar.php:7中开始输出）第24行/login.php

以下代码如下：的login.php：

<?php include 'connect.php'; ?>
<?php include 'functions.php'; ?>
<?php include 'title_bar.php'; ?>
<html>
<head>
<title>Login - Private Message System</title>
</head>
<body>
<div>
<h3> Login- Private message system </h3>
<form method='post'>
<?php
if(isset($_POST['login'])){
    $username = $_POST['username'];
    $password = md5($_POST['password']);    
    if(empty($username) or empty($password)){
    $message= "Fields empty";   
} else{
    $check_login = mysql_query("SELECT id FROM `users` WHERE `username`='$username' AND `password`='$password'");
    if(mysql_num_rows($check_login)==1){
        $run_login = mysql_fetch_array($check_login);
        $user_id = $run_login['id'];
        $_SESSION['user_id'] = $user_id;
        header('location: index.php');
    } else{
        $message = "Username or password incorrect";
    }
    }
    echo "<p>$message</p>";
}
?>
Username :<br/>
<input type ='text' name='username'/>
<br/><br/>
Password : <br/>
<input type='password' name='password'/>
<br/><br/>
<input type='submit' name="login" value='Log in'/>
</form>
</div>
</body>
</html>

title_bar.php：

<?php
if(loggedin()){
    ?>
<a href='index.php'>home</a>
<a href='messages.php'>messages</a>
<a href='logout.php'>logout</a>
    <?php   
}else{
?>
<a href='index.php'>home</a>
<a href='login.php'>Log in</a>
<a href='register.php'>Register</a>
<?php       
}
?>

PHP中的session_start错误

0 个答案: