<?php session_start(); header('content-type:text/html;charset=utf-8'); $servername="localhost"; $username="root"; $passwd="123456"; $dbname="ykq_db"; $conn=new mysqli($servername,$username,$passwd,$dbname); if($conn->connect_error){ die("Connection failed:".$conn->connect_error); echo"连接数据库失败"; } $number=$_POST["qq"]; $author=$_POST["author"]; $email=$_POST["email"]; $sql="UPDATE details SET qq='$number' WHERE id=1"; $conn->query($sql); if($conn->query($sql)==TRUE){ echo "<script> alert('网站信息修改成功'); window.history.back(); </script>"; } ?>
时间: 2024-03-14 18:49:43 浏览: 56
该 PHP 代码看起来没什么问题,但是需要确认以下几个方面是否正确:
1. PHP 代码所在的文件是否与 HTML 表单所在的文件在同一个目录下。
2. HTML 表单中的 input 标签的 name 属性是否正确,需要确保与 PHP 代码中的 $_POST 变量名一致。
3. 表名和字段名是否与数据库中的实际情况一致。
4. 数据库中是否存在 id 为 1 的记录,如果不存在则 UPDATE 操作会失败。
如果确认以上几个方面都没有问题,可以尝试打印出 $sql 变量的值,查看生成的 SQL 语句是否符合预期。如果还是无法解决问题,可以提供更多的错误信息和上下文,让我更好地帮助你解决问题。
相关问题
这段代码有错误,请帮我找出并修正<?php header("Content-type:text/html; charset=utf-8"); session_start(); include "huanying.php"; $test=$_SESSION['code']; $user=$_POST['user']; $password=$_POST['password']; $yzm=$_POST['yzm']; if($yzm==$test){ $_SESSION['username']=$user; $cr="INSERT INTO emp(username,password)values('$user','$password')"; mysqli_query($conn,$cr); if(mysqli_affected_rows($conn)>0){ echo"<script language='javascript'>"; echo "alert('注册成功');"; echo "location.href='lianjie.php'"; echo "</script>"; } else { echo"<script language='javascript'>"; echo "alert('注册失败')"; echo "</script>"; } } else { echo"<script language='javascript'>"; echo "alert('验证码错误,请重新输入');"; echo "location.href='wangye.php'"; }
这段代码中存在一个问题,即 `$conn` 变量未定义。在这里我们可以猜测 `$conn` 是一个数据库连接对象,但是在这段代码中并没有对其进行定义和初始化。
因此,我们需要在这段代码中添加 `$conn` 变量的定义和初始化代码。假设您使用的是 mysqli 扩展,可以按照以下方式定义 `$conn` 变量:
```php
<?php
header("Content-type:text/html; charset=utf-8");
session_start();
include "huanying.php";
$servername = "localhost";
$username = "root";
$password = "yourpassword";
$dbname = "yourdatabase";
// 创建连接
$conn = mysqli_connect($servername, $username, $password, $dbname);
// 检查连接
if (!$conn) {
die("连接失败: " . mysqli_connect_error());
}
$test = $_SESSION['code'];
$user = $_POST['user'];
$password = $_POST['password'];
$yzm = $_POST['yzm'];
if ($yzm == $test) {
$_SESSION['username'] = $user;
$cr = "INSERT INTO emp(username, password) VALUES('$user', '$password')";
mysqli_query($conn, $cr);
if (mysqli_affected_rows($conn) > 0) {
echo "<script language='javascript'>";
echo "alert('注册成功');";
echo "location.href='lianjie.php'";
echo "</script>";
} else {
echo "<script language='javascript'>";
echo "alert('注册失败')";
echo "</script>";
}
} else {
echo "<script language='javascript'>";
echo "alert('验证码错误,请重新输入');";
echo "location.href='wangye.php'";
echo "</script>";
}
// 关闭连接
mysqli_close($conn);
?>
```
上述代码中,我们定义了 `$servername`、`$username`、`$password` 和 `$dbname` 变量,这些变量分别对应了数据库服务器地址、用户名、密码和数据库名,您需要将这些变量的值替换为您自己的数据库连接信息。同时,我们使用 `mysqli_connect()` 函数来创建连接,使用 `mysqli_close()` 函数来关闭连接。
html+php+mysql登录注册页面
下面是一个简单的HTML+PHP+MySQL登录注册页面的示例:
index.html:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login or Register</title>
</head>
<body>
<h1>Login or Register</h1>
<p>Please choose:</p>
<ul>
<li><a href="login.php">Login</a></li>
<li><a href="register.php">Register</a></li>
</ul>
</body>
</html>
```
login.php:
```php
<?php
session_start();
if(isset($_SESSION["username"])) {
header("Location: welcome.php");
exit();
}
require_once("config.php");
if(isset($_POST["username"]) && isset($_POST["password"])) {
$username = $_POST["username"];
$password = md5($_POST["password"]);
$sql = "SELECT * FROM users WHERE username='$username' AND password='$password'";
$result = mysqli_query($conn, $sql);
if(mysqli_num_rows($result) == 1) {
$row = mysqli_fetch_assoc($result);
$_SESSION["username"] = $row["username"];
header("Location: welcome.php");
exit();
} else {
$error = "Invalid username or password";
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Login</title>
</head>
<body>
<h1>Login</h1>
<?php if(isset($error)) echo "<p style='color:red;'>$error</p>"; ?>
<form method="post" action="">
<p>
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>
</p>
<p>
<label for="password">Password:</label>
<input type="password" id="password" name="password" required>
</p>
<p>
<button type="submit">Login</button>
</p>
</form>
</body>
</html>
```
register.php:
```php
<?php
require_once("config.php");
if(isset($_POST["username"]) && isset($_POST["password"])) {
$username = $_POST["username"];
$password = md5($_POST["password"]);
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
if(mysqli_query($conn, $sql)) {
header("Location: login.php");
exit();
} else {
$error = "Registration failed";
}
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Register</title>
</head>
<body>
<h1>Register</h1>
<?php if(isset($error)) echo "<p style='color:red;'>$error</p>"; ?>
<form method="post" action="">
<p>
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>
</p>
<p>
<label for="password">Password:</label>
<input type="password" id="password" name="password" required>
</p>
<p>
<button type="submit">Register</button>
</p>
</form>
</body>
</html>
```
config.php:
```php
<?php
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "mydb";
$conn = mysqli_connect($servername, $username, $password, $dbname);
if(!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
?>
```
注意:这只是一个简单的示例,实际应用中需要进行更多的安全性检查和数据验证。
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