直入主题，先看php校验登录名和密码是否正确的代码：
<?php $servername = "服务器名"; $username = "账户名"; $password = "密码"; $dbname = "数据库名"; ?> <?php // Session需要先启动。 session_start(); //判断uname和pwd是否赋值 if(isset($_POST['uname']) && isset($_POST['pwd'])){ $name = $_POST['uname']; $pwd = $_POST['pwd']; //连接数据库 $conn = new mysqli($servername, $username, $password, $dbname); if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } //验证内容是否与数据库的记录吻合。 $sql = "SELECT * FROM test_students_all WHERE (student_name='$name') AND (password='$pwd')"; //执行上面的sql语句并将结果集赋给result。 $result = $conn->query($sql); //判断结果集的记录数是否大于0 if ($result->num_rows > 0) { $_SESSION['user_account'] = $name; // 输出每行数据 while($row = $result->fetch_assoc()) { echo '<p>' . $row['student_nbr'] . '<br/>' . $row['student_name'] . '(' . $row['sex'] . ')' . '<br/>' . $row['class'] . '<br/>' . $row['major'].'</p>'; // <p><img src="https://www.jb51.net/student_images/CLASS/STUDENT_NBR.jpg" /></p> echo '<p><img src="student_images/' . $row['class'] . 'https://www.jb51.net/' . $row['student_nbr'] . '.jpg" /></p>'; } } else { echo "没有您要的信息"; } $conn->close(); } ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>登录校验</title> </head> <body> <p> <?php // isset(xx) 测试xx是否设置了 if(isset($_SESSION['user_account'])){ echo '你好，' . $_SESSION['user_account']; } else{ echo '游客'; } //$conn->close(); ?> </p> <form method="POST"> <input type="text" placeholder="用户名" /> <br /> <input type="password" placeholder="密码" /> <br /> <input type="submit"> </form> </body> </html>
效果图：
