php+MySQL实现登录时验证登录名和密码是否正确

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="student_images/CLASS/STUDENT_NBR.jpg" /></p>

echo '<p><img src="student_images/' . $row['class'] . '/' . $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" 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:

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