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="/static/imghwm/default1.png" data-src="student_images/CLASS/STUDENT_NBR.jpg" class="lazy" / alt="php+MySQL实现登录时验证登录名和密码是否正确_PHP" ></p>
echo '<p><img src="/static/imghwm/default1.png" data-src="http://img.bitscn.com/upimg/allimg/c160515/1463303D62Q20-12949.jpg" class="lazy" . $row['class'] . '/' . $row['student_nbr'] . '.jpg" / alt="php+MySQL实现登录时验证登录名和密码是否正确_PHP" ></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" name="uname" placeholder="用户名" />
<br />
<input type="password" name="pwd" placeholder="密码" />
<br />
<input type="submit">
</form>
</body>
</html>
效果图：
以上就是本文的全部内容，希望对大家学习php程序设计有所帮助。
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