PHP提交表单工作不正常

我在我的博客页面上有一个基本的登录表单，当我输入正确的用户名和密码时，它表明用户名+密码是正确的，但我没有被重定向到index1.php页面

这是我的密码：

<?php
    require_once('header.php');
    require_once('config.php');

$db = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

    //check to see if form has been submitted
    if (isset($_POST['submit'])) {
    if ($_POST['username'] == 'bruce' && ($_POST['password'] == 'wayne')) {
        echo 'Correct username and password.';
    }
    else {
        echo 'Incorrect username or password. Please try again.';
    }

    $result = mysqli_query($db, $sql);
    $numrows = mysqli_num_rows($result);

    if($numrows == 1) {
        $row = mysqli_fetch_array($result, MYSQLI_ASSOC);
        $_SESSION['USERNAME'] = $row['username'];
        $_SESSION['USERID'] = $row['id'];

        header("Location:"."index1.php");
    }
    else {
        header("Location"."login.php?error=1");
    }
}

    else {
        if(isset($_GET['error'])) {
            echo "Incorrect login, please try again!";
        }
    }
?>

<form action="<?php echo $_SERVER['index1.php'] ?>" method="post">
<table id='login'>
<tr>
    <td>Username</td>
    <td><input type="text" name="username"></td>
</tr>
<tr>
    <td>Password</td>
    <td><input type="password" name="password"></td>
</tr>
<tr>
    <td></td>
    <td><input type="submit" name="submit" value="Login!"></td>
</tr>
</table>
</form>

在

header（）函数之后使用
exit（）
或
die（）
函数。否则，脚本将不会终止。下面是一个相关的例子：

首先，您需要使用
session_start（）
在php中使用会话之前，如果未使用，则$\u会话将成为普通数组，并且不再被记住。
除非使用输出缓冲，否则无法在重定向之前进行回显。我把你的回音注释掉了

我一直用这个。您必须在重定向后调用exit

/**
 * This is designed to redirect using a quick, easy function.
 */
function gfRedir($_NewPath){
    header('Location: '.$_NewPath);
    exit();
}

header("Location:index1.php");
exit();

你会像这样使用它：

<?php
    require_once('header.php');
    require_once('config.php');

$db = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);

    //check to see if form has been submitted
    if (isset($_POST['submit'])) {
    if ($_POST['username'] == 'bruce' && ($_POST['password'] == 'wayne')) {
       //you cannot echo before a redirect unless you are using output buffering.
      //echo 'Correct username and password.';
    }
    else {
        //you cannot echo before a redirect unless you are using output buffering.
        //echo 'Incorrect username or password. Please try again.';
    }

    //where is this $sql at that you are passing into the below function? 

    $result = mysqli_query($db, $sql);
    $numrows = mysqli_num_rows($result);

    if($numrows == 1) {
       $row = mysqli_fetch_array($result, MYSQLI_ASSOC);
       $_SESSION['USERNAME'] = $row['username'];
       $_SESSION['USERID'] = $row['id'];

       gfRedir('index2.php');
    }
    else {

       gfRedir('login.php?error=1');
    }
   }

    else {
        if(isset($_GET['error'])) {
            echo "Incorrect login, please try again!";
        }
    }


    function gfRedir($_NewPath){
        header('Location: '.$_NewPath);
        exit();
    }
?>

<form action="<?php echo $_SERVER['index1.php'] ?>" method="post">
<table id='login'>
<tr>
    <td>Username</td>
    <td><input type="text" name="username"></td>
</tr>
<tr>
    <td>Password</td>
    <td><input type="password" name="password"></td>
</tr>
<tr>
    <td></td>
    <td><input type="submit" name="submit" value="Login!"></td>
</tr>
</table>
</form>


请尝试将此语法用于重定向

/**
 * This is designed to redirect using a quick, easy function.
 */
function gfRedir($_NewPath){
    header('Location: '.$_NewPath);
    exit();
}

header("Location:index1.php");
exit();

谢谢你
哪里定义了
$db
？你的
$sql
语句在哪里？我看不到。你有没有收到错误，比如“headers ready sent”？@michaelhanon没有，我没有收到任何错误。我只是停留在我的登录。php@chris试试下面我的答案，它现在说密码或用户名不正确。不，这只是一个片段，你需要把它粘贴到你当前的代码中。