PHP未定义变量错误, 我的简单代码和错误复制到下面了

代码：

<?php
if ($_POST[name]&&$_POST[password]){

$name=$_POST[name];
$pass=$_POST[password];
setcookie('id',$name);
setcookie('pass',$pass);
}
if ($_COOKIE[id]&&$_POST[pass]){
echo "登陆成功<br>用户 ：".$_COOKIE[id]."<br>密码：".$_COOKIE[pass];
}

?>
<form action="" method="post">
用户：
<input type="text" name="name"><br><br>
密码：
<input type="password" name="password"><br>
<input type="submit" name="sub" value="登陆">

</form>

出现的错误：

Notice: Use of undefined constant name - assumed 'name' in C:\wamp\www\aa\test.php on line 2

Notice: Undefined index: name in C:\wamp\www\aa\test.php on line 2

Notice: Use of undefined constant id - assumed 'id' in C:\wamp\www\aa\test.php on line 9

Notice: Undefined index: id in C:\wamp\www\aa\test.php on line 9

<?php if ($_POST['sub']){

$name=$_POST['user']; $pass=$_POST['pass']; setcookie('id',$name); setcookie('pass',$pass); } if ($_COOKIE[id]&&$_POST[pass]){ echo "登陆成功<br>用户 ：".$_COOKIE[id]."<br>密码：".$_COOKIE[pass]; }

?> <form action="" method="post"> 用户： <input type="text" name="user"><br><br> 密码： <input type="password" name="pass"><br> <input type="submit" name="sub" value="登陆">

</form>