login.html 负责收集用户填写的登录信息
<html>
<head>
<title></title>
</head>
<body>
<fieldset>
<legend>用户登录</legend>
<form name="LoginForm" method="post" action="login.php" onSubmit="return InputCheck(this)">
<p>
<label for="username" class="label">用户名:</label>
<input id="username" name="username" type="text" class="input" />
<p/>
<p>
<label for="password" class="label">密码:</label>
<input id="password" name="password" type="password" class="input" />
<p/>
<p>
<input type="submit" name="submit" value="确定" class="left" />
</p>
</form>
</fieldset>
</body>
</html>
登录处理login.php 负责处理用户登录与退出动作
<?php
header("Content-Type:text/html;charset=utf-8");
if(!isset($_POST['submit'])){
exit('非法访问!');
}
$username = htmlspecialchars($_POST['username']);
$password = MD5($_POST['password']);
//包含数据库连接文件
include('conn.php');
//检测用户名及密码是否正确
$check_query = mysql_query("select uid from user where username='$username' and password='$password' limit 1");
if($result = mysql_fetch_array($check_query)){
//登录成功
$_SESSION['username'] = $username;
echo $username,' 欢迎你！进入 <a href="my.php">用户中心</a><br />';
echo '点击此处 <a href="login.php?action=logout">注销</a> 登录！<br />';
exit;
} else {
exit('登录失败！点击此处 <a href="javascript:history.back(-1);">返回</a> 重试');
}
退出处理处理用户退出的代码跟处理登录的代码都在 login.php 里。 session_start();
//注销登录
if($_GET['action'] == "logout"){
unset($_SESSION['username']);
echo '注销登录成功！点击此处 <a href="login.html">登录</a>';
exit;
}
?>
my.php
<?php
header("Content-Type:text/html;charset=utf-8");
session_start();
//检测是否登录，若没登录则转向登录界面
if(!isset($_SESSION['userid'])){
header("Location:login.html");
exit();
}
//包含数据库连接文件
include('conn.php');
$userid = $_SESSION['userid'];
$username = $_SESSION['username'];
$user_query = mysql_query("select * from user where uid=$userid limit 1");
$row = mysql_fetch_array($user_query);
echo '用户信息：<br />';
echo '用户ID：'.$userid.'<br />';
echo '用户名：'.$username.'<br />';
echo '<a href="login.php?action=logout">注销</a> 登录<br />';
?>