PHP头部命令不起作用

问题描述

我有一个问题，让我的代码在我很快就要推出的网站上工作。特别是当我登录标题后，登录成功后不会重定向。我多次使用过这些代码，而且我从来没有遇到过任何问题。现在唯一的区别是我正在使用不同的服务器和不同的数据库。这是给我带来麻烦的代码：

 <？php 
 / *设置所有变量* / 
 $ email = $ _POST ['email']; 
 
 $ password = sha1（$ _ POST ['password']）; / *散列密码* / 
 
 $ conn = mysqli_connect（'servername'，'username'，'password'，'databasename'）或die（'Error connecting to MySQL server'）; 
 / *从users表中选择符合条件的id * / 
 $ sql =SELECT id FROM users WHERE email ='$ email'AND password ='$ password'; 
 
 $ result = mysqli_query（$ conn，$ sql）或die（'查询数据库错误'）; 
 
 $ count = mysqli_num_rows（$ result）; 
 
 if（$ count == 1）{
 echo'登录成功。'; 
 
 $ row = mysqli_fetch_array（$ result）; 
 
 session_start（）; 
 
 $ _SESSION ['user_id'] = $ row ['id']; 
 
 / *如果真正转入用户表* / 
 header（'location：users_table.php'）; 
 
 
 
如果无效提示他们调整以前的记录* / 
 else {
 echo'< h2>无效登录< h2>< br />'; 
 echo'< h2>点击< a href =javascript：history.go（-1）>这里< / a>返回并调整您的输入。< / h2>'; 
} 
 
 
 mysqli_close（$ conn）; 
 
？> 
  

这不是一个正确连接的问题，因为我得到'成功登录'的消息， t重定向。

---

感谢所有的答案，我尝试删除回显，但我现在得到的只是一个空格页面，我想也许这是我使用的浏览器，所以我切换到另一个，我仍然只是得到一个空白页面，任何其他建议？

解决方案

你不能在你的标题语句之前回应任何内容。

  echo'登录成功'。 
  

这导致头工作。

I'm having a problem getting this code to work on the website that I'd like to launch soon. In particular when I sign in the header won't redirect after a successful login. I have used this code before many times and I've never had a problem with it. The only difference now is that I'm using a different server and a different database. Here's the code that is giving me trouble:

<?php
/*set all the variables*/
$email = $_POST['email'];

$password = sha1($_POST['password']);   /* hash the password*/

$conn = mysqli_connect ('servername', 'username', 'password', 'databasename') or die('Error connecting to MySQL server');
/*select the id from the users table that match the conditions*/
$sql = "SELECT id FROM users WHERE email = '$email' AND password = '$password'";

$result = mysqli_query($conn, $sql) or die('Error querying database.');

$count = mysqli_num_rows($result);

if ($count == 1) {
echo 'Logged in Successfully.';

$row = mysqli_fetch_array($result);

session_start();

$_SESSION['user_id'] = $row['id'];

/*If true head over to the users table*/
header('location: users_table.php');


}
/*If invalid prompt them to adjust the previous entry*/
else {
echo '<h2>Invalid Login</h2><br />';
echo '<h2>Click <a href="javascript:history.go(-1)">HERE</a> to go back and adjust your entry.</h2>';
                    }


mysqli_close($conn);

?>

It's not a matter of it connecting properly because I get the message 'successful Login' but it won't redirect at all.

---

Thanks for all the answers, I tried removing the echo but all I get now is a blank page, I thought maybe it was the browser I was using so I switched to another and I still just get a blank page, any other suggestions?

解决方案

You cannot echo anything before your header statement.

echo 'Logged in Successfully.';

This is causing the header call to not work.

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