1.登录成功时将登录用户名写入session
if($login_result->num_rows > 0){
$_SESSION['username'] = $username;
header('Location:./index.php');
}
2.根目录新建functions.php文件
<?php
session_start();
function check_login()
{
if(empty($_SESSION['username'])){
header('Location:./login.php');
}
}
3.要做登录验证的文件引入functions.php
<?php
require_once('../functions.php');
check_login();
?>
