按钮类型提交不向服务器发送数据

Question

我是 PHP 的新手。我正在制作一个登录表单。这是我的 html:

<form method="POST" id="login_form" action="log_in.php">
    <div class="form-group">
        <label for="Username">Username</label>
        <input autocomplete="off" type="text" class="form-control" id="username" required>

    </div>
    <div class="form-group">
        <label for="Password">Password</label>
        <input autocomplete="off" type="password" class="form-control" id="password" required>
    </div>
    <button type="submit" id="submit_login" class="btn">Log in</button>
</form>

这是我的 log_in.php

<?php
include("db.php");


if ($_SERVER['REQUEST_METHOD']=='POST') {
    $username = $_POST["username"];
    $password = $_POST["password"];
    $stmt = $conn->prepare("SELECT * FROM users WHERE username=? AND pass=?");
    $stmt->bind_param("ss", $username, $password);
    $stmt->execute();
    $result = $stmt->get_result();
    $check = mysqli_num_rows($result);
    if ($check > 0) {
        while ($row = $result->fetch_assoc()) {
            if ($username == $row['username'] && (password_verify($password, $row['pass']) || $password == $row['pass'])) {
                if ($row['stat'] == "Admin") {
                    $conn->close();
                    header("Location: admin.php");
                    break;
                } else {
                    $conn->close();
                    header("Location: member.php");
                    break;
                }
            }
        }
    }
}
else {
    echo "<script>";
    echo "alert('No Matching Records!');";
    echo "</script>";
}
?>

问题是我认为按钮没有向服务器提交用户名和密码。我得到一个错误 Undefined index:username 和 Undefined index:password。它不会登录并加载到 header 目的地。我找不到问题所在。提前谢谢你！

Answer 1

为您的输入添加名称：

<form method="POST" id="login_form" action="log_in.php">
    <div class="form-group">
        <label for="username">Username</label>
        <input autocomplete="off" type="text" class="form-control" id="username" name="username" required>

    </div>
    <div class="form-group">
        <label for="password">Password</label>
        <input autocomplete="off" type="password" class="form-control" id="password" name="password" required>
    </div>
    <button type="submit" id="submit_login" class="btn">Log in</button>
</form>

还要注意这个

$stmt = $conn->prepare("SELECT * FROM users WHERE username=? AND pass=?");
$stmt->bind_param("ss", $username, $password);
$stmt->execute();

如果您在数据库中散列您的密码，将永远不会 return 任何东西（我希望您这样做？！）。您应该将其从查询中删除。

$stmt = $conn->prepare("SELECT * FROM users WHERE username=?");
$stmt->bind_param("s", $username);
$stmt->execute();

有关详细信息，请参阅 password_hash documentation。

按钮类型提交不向服务器发送数据

Button type submit not sending data to the server

html

php

mysqli