登录时重定向

登录后，我试图重定向回我的索引.php页面，但我遇到了问题。

这是我的登录名.php：

<?php
session_start();
include_once 'dbconnect.php';
if(isset($_SESSION['user'])!=""){
    header("home.php");
}
if(isset($_POST['btn-login'])){
    $email = mysql_real_escape_string($_POST['email']);
    $upass = mysql_real_escape_string($_POST['pass']);
    $res=mysql_query("SELECT * FROM users WHERE email='$email'");
    $row=mysql_fetch_array($res);
    if($row['password']==md5($upass))
    {
        $_SESSION['user'] = $row['user_id'];
        header("home.php");
    }else{
    ?>
    <script>alert('wrong details');</script>
    <?php
    }
}
?>

这是我的家.php：

<?php
session_start();
include_once 'dbconnect.php';
if(!isset($_SESSION['user'])){
    header("Location: index.php");
}
$res=mysql_query("SELECT * FROM users WHERE user_id=".$_SESSION['user']);
$userRow=mysql_fetch_array($res);
?>

这是我索引中的导航栏.php：

<!-- Nav Bar -->
<nav class="navbar navbar-default navbar-fixed-top navbar-left">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
                <a class="navbar-brand brand" href="#" style="font-family: Warnes">Unleasht</a>
        </div>
    <div class="collapse navbar-collapse">
        <ul class="nav navbar-nav">
            <li><a href="#">HOME</a></li>
            <li><a href="#about">ABOUT</a></li>
            <li><a href="#music" data-toggle="collapse" data-target=".navbar-collapse.in">MUSIC</a></li>
            <li><a href="#contact" data-toggle="collapse" data-target=".navbar-collapse.in">CONTACT</a></li>
        </ul>
        <ul class="nav navbar-nav navbar-right">
            <?php
            function loggedIn(){
            if(isset($_SESSION['username'])!="")
            { echo '<li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">'. $_SESSION['username'] .'<span class="caret"></span></a>
                   <ul class="dropdown-menu">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Another action</a></li>
                        <li><a href="#">Something else here</a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="#">Separated link</a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="#">One more separated link</a></li>
                    </ul>
                </li>';
            }else{
                echo '<li><a href="#login" data-toggle="modal" data-target="#login" id="loginbtn"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>';
                }
            }
            loggedIn();
            ?>
        </ul>
    </div><!--/.nav-collapse -->
    </div>
</nav>

但它们都不在同一个文件中。登录.php的位置在 assets/php/login/login 中.php

我可以得到一些帮助吗？