效果：
代码：
<?php
//设置编码
header("content-type:text/html; charset=utf-8"); //接收提交的数据
//判断是否接受提交了表单
if (isset($_POST['submit'])) {
$userarray = array();
$userarray['useraccount'] = isset($_POST['useraccount']) ? $_POST['useraccount'] : null;
$userarray['userpassword'] = isset($_POST['userpassword']) ? $_POST['userpassword'] : null;
$ismemory = isset($_POST['ismemory']) ? true : null; //判断需要参数是否为空
foreach ($userarray as $user) {
if ($user == null) {
echo '参数为空！';
exit();
}
} //验证账号密码
if ($userarray[''] == '123456' && $userarray[''] == '123456') {
//判断是否存储账户
if ($ismemory) {
//存储cookie
//长期有效
setcookie('useraccount',$userarray['useraccount']);
} //登录成功，跳转页面
header('location:http://www.baidu.com');
}
}
?>
<html>
<head>
<title>登录页面</title>
</head>
<body>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<table>
<tr>
<td>账号：</td>
<td><input type="text" name="useraccount" value="<?php echo $_COOKIE['useraccount']; ?>"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" name="userpassword"></td>
</tr>
<tr>
<td></td>
<td><input type="checkbox" name="ismemory">是否记住账号？</td>
</tr>
<tr>
<td></td>
<td><input type="submit" name="submit" value="登录"></td>
</tr>
</table>
</form>
</body>
</html>