写的登陆页面一直无法跳转到欢迎界面，大佬看下哪里不对。点击登陆还是显示登陆框，没有预想的欢迎语句。

感觉可能是session的使用出了问题，但是查不出来。

首页

<!DOCTYPE html>
<html>
<head>  
<meta charset="utf-8"> 
<title>ecshop</title> 
<link rel="stylesheet" 
          href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css"> 
<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>  
<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js">
</script>
</head>
<div class="container"> 
 <div class="row clearfix">   
 <div class="col-md-8 column">          
 <div class="page-header">                
<h1>                  ECSHOP              </h1>         </div>        </div>        
<div class="col-md-4 column">               
 <?php     // 引入 functions.php 文件   require_once("loginfunction.php");     //登录状态显示用户名，未登录显示登录表单    $loginfc = new indexlogin();    $loginfc->loggedIn();                ?>                             
 </div>    
</div>

loginfunction

<?phpclass indexlogin{
                                 function loggedIn(){        //通过 $_SESSION  来判断用户是否登录   
 if(empty($loggd)){                     
                              echo<<<LOG        
                            <form class="form-horizontal" 
                               method="post" action="loginaction.php">                                    ID<input type="text" class="form-control" name="id">
<br>                                                 
Password <input type="password" 
class="form-control" name="pass">
<br>                                  
 <input type="submit" value="ログイン">                             
 </form>LOG;       
 }else{  // 登录显示欢迎页面         
echo 'Welcome, ' . $loggd;                
echo <<<BUT        
<input type="button" value="logout" 
onclick="logoutFunction()">BUT;                                         
   }
 } }?>

loginaction

<?
php$user = "r.ko";
$password = "123";
$id = $_POST['id'];
$pass = $_POST['pass']; 
$dbh = new PDO('mysql:
host=localhost;dbname=user;
charset=utf8', $user, $password);  
$dbh->setAttribute(
                      PDO::ATTR_ERRMODE, 
                     PDO::ERRMODE_EXCEPTION
); 
 $sql = "select pass FROM id where id =" .$id;  $stmt = $dbh->query($sql);   
 $result = $stmt->fetchAll(PDO::FETCH_ASSOC) ;  
$url = "http://localhost/boot/index.php";    if(!empty($result)){         if($pass == $result[0]['pass']){         
                                              $_SESSION["id"] = $id;     
                                              $_SESSION["loggd"] = 1;
                              echo "<
                                script language = 'javascript'type = 'text/javascript'>";
echo " window.location.href = '$url' ";  
echo "</script>";  }
else{      
                              echo<<<LOW        
             <div class="alert alert-danger" role="alert">     
             <a href="$url" class="alert-link">
PASSERR TRY AGAIN
</a>        
</div>LOW; 
   }} 
else{        
echo<<<LOF        
<div class="alert alert-danger" role="alert">       
 <a href="$url" class="alert-link">ERR TRY AGAIN</a>        </div>LOF;   
 }    
$dbh = null;
?>