php 账号密码登陆代码
时间: 2023-11-11 09:04:52 浏览: 79
PHP账号密码登录代码如下:
```php
//检查用户是否登录
function checklogin(){
if(isset($_SESSION['username']) && !empty($_SESSION['username'])){
return true;
}else{
return false;
}
}
//验证用户登录信息
function login($username,$password){
//连接数据库
$conn = mysqli_connect('localhost','root','123456',test');
if(!$conn){
die('连接失败:'.mysqli_connect_error());
}
//查询用户信息
$sql = "SELECT * FROM user WHERE username='$username' AND password='$password'";
$result = mysqli_query($conn,$sql);
if(mysqli_num_rows($result) > 0){
//登录成功,设置session
$_SESSION['username'] = $username;
return true;
}else{
//登录失败
return false;
}
}
//退出登录
function logout(){
//清除session
session_unset();
session_destroy();
}
```