index.php
<?php
session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="zh-CN">
<head>
<title>歡迎頁(yè)面</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<h1>歡迎訪問(wèn)todolist</h1>
</body>
</html>
<?php
if(isset($_SESSION['user_id'])){
echo'<a href="logout.php">注銷(xiāo)</a>';
echo"<br />";
echo'<a href="changepassword.php">更改密碼</a>';
}else{
echo'<a href="login.php">登錄</a>';
echo"<br />";
echo'<a href="register.php">注冊(cè)</a>';
}
?>
我們用會(huì)話對(duì)首頁(yè)進(jìn)行不同的排版
(1)用戶未登陸,會(huì)出現(xiàn)登錄和注冊(cè)鏈接
(2 )用戶已登錄职员,則出現(xiàn)注銷(xiāo)和更改密碼鏈接