文件结构：
config.php：
<?php /**1、数据库服务器 */ define('DB_HOST','localhost'); /**2、数据库用户名 */ define('DB_USER','root'); /**3、数据库密码 */ define('DB_PWD','root'); /**4、数据库名 */ define('DB_NAME','login'); /**5、字符集 */ define('DB_CHARSET','utf8'); ?>
connection.php：
<?php /**1、引入常量配置文件 */ include './config.php'; /**2、连接数据库、判断错误、选择库和字符集*/ $connect = mysqli_connect(DB_HOST,DB_USER,DB_PWD,DB_NAME,'3306'); if(!$connect){ exit('连接失败，原因:'.mysqli_error($connect)); }else{ echo '连接成功'; } /**设置字符集 */ mysqli_set_charset($connect,DB_CHARSET); ?>
login.html：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>登录</title> </head> <body> <form action="./loginSession.php" method="POST"> 用户名：<input type="text" name="username" id=""> <hr> 密码：<input type="password" name="password" id=""> <hr> <input type="submit" value="登录"> </form> </body> </html>
loginSession.php：
<?php /**连接数据库、选择库、设置字符集 */ include './connection.php'; /**开启session */ session_start(); /**判断 */ if(($_POST['username'] !=null ) && ($_POST['password'] != null )) { $userName = $_POST['username']; $password = $_POST['password']; $res = mysqli_query($connect,"select * from user where `username` = '$userName' "); if(!$res){ printf("Error:%s ",mysqli_error($connect)); exit(); } $row = mysqli_fetch_assoc($res); if ($row['password'] == $password) { /**密码验证通过，设置session，把用户名和密码保存在服务端 */ $_SESSION['userName'] = $userName; $_SESSION['password'] = $password; /**最后跳转到登录后的欢迎页面 注意：这里我们没有像cookie一样带参数过去 */ header('Location: welcome.php'); }else{ exit('密码有误'); } } ?>
welcome.php：
<?php session_start(); $userName = $_SESSION['userName']; ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>欢迎</title> </head> <body> welcome--你好：<?php echo $userName;?> </body> </html>
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