如何在PHP成功登录后重定向

我试图使这段代码工作，但由于某种原因我不能:

<?php
include 'AS.php';
//csrf protection
if(empty($_SERVER['HTTP_X_REQUESTED_WITH']) || strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') 
    die("Sorry bro!");
$url = parse_url( isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '');
if( !isset( $url['host']) || ($url['host'] != $_SERVER['SERVER_NAME']))
    die("Sorry bro!");
$action = $_POST['action'];
switch ($action) {
    case 'checkLogin':
        $logged = $login->userLogin($_POST['username'], $_POST['password']);
        if($logged === true)
header( "refresh: 5; url=index.php" ); 
echo 'You''ll be redirected in about 5 secs. ';
echo 'If not, click <a href="index.php">here</a>.';
        break;                       

不知道为什么header("refresh: 5;url = index . php ");

如果我只是尝试头重定向，它做的工作，但页面不能正确加载，它加载与一些CSS问题，所以我决定使用刷新。

这个想法是，当用户登录时，它只是刷新页面，所以他将在我的脚本的后端区域。

好吧，所以我认为是我的错误没有解释好情况:

<?php
include 'AS.php';
//csrf protection
if(empty($_SERVER['HTTP_X_REQUESTED_WITH']) || strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) != 'xmlhttprequest') 
    die("Sorry bro!");
$url = parse_url( isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '');
if( !isset( $url['host']) || ($url['host'] != $_SERVER['SERVER_NAME']))
    die("Sorry bro!");
$action = $_POST['action'];
switch ($action) {
    case 'checkLogin':
        $logged = $login->userLogin($_POST['username'], $_POST['password']);
        if($logged === true)
            echo "true";
        break;
    case "registerUser":
        $register->register($_POST['user']);
        break;
    case "addUser":
        $registeruser->registeruser($_POST['user']);
        break;
    case "resetPassword":
        $register->resetPassword($_POST['newPass'], $_POST['key']);
        break;
    case "forgotPassword":
        $register->forgotPassword($_POST['email']);
        break;
    case "logout":
        ASSession::destroySession();
        break;
    case "postComment":
        $ASComment = new ASComment();
        echo $ASComment->insertComment(ASSession::get("user_id"), $_POST['comment']);
        break;
    case "updatePassword":
        $user = new ASUser(ASSession::get("user_id"));
        $user->updatePassword($_POST['oldpass'], $_POST['newpass']);
        break;
    case "updateDetails":
        $user = new ASUser(ASSession::get("user_id"));
        $user->updateDetails($_POST['details']);
        break;
    case "updateEmail":
        $user = new ASUser(ASSession::get("user_id"));
        $user->updateEmail($_POST['email']);
        break;
    case "updateUser":
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit();
        //$idusuario = ASSession::get("iduser");
        $username = $_POST['userdata']['username'];
        $result = $db->select("SELECT * FROM `as_users` WHERE `username` = :u", array( 'u' => $username ));
        $user = new ASUser($result[0]['user_id']);
        $user->updateUser($_POST['userdata']);
        break;
    case "updatePass":
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit();
        $idusuario = ASSession::get("iduser");
        $result = $db->select("SELECT * FROM `as_users` WHERE `user_id` = :u", array( 'u' => $idusuario ));
        $user = new ASUser($result[0]['user_id']);
        $user->updatePass($_POST['newpass']);
        break;
    case "changeRole":
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit();
        $user = new ASUser($_POST['userId']);
        echo ucfirst($user->changeRole());
        break;
    case "deleteUser":
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit();
        $user = new ASUser($_POST['userId']);
        $user->deleteUser();
        break;
    case "getUserDetails":
        $user = new ASUser($_POST['userId']);
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit();
        $info = $user->getInfo();
        //prepare and output result
        $result             = $user->getDetails();
        $result['email']    = $info['email'];
        $result['username'] = $info['username'];
        echo json_encode($result);
        break;
    case "addRole": 
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit();
        $res = $db->select("SELECT * FROM `as_user_roles` WHERE `role` = :r", array( 'r' => $_POST['role'] ));
        if(count($res) == 0) {
            $db->insert("as_user_roles", array("role" => strtolower(strip_tags($_POST['role']))));
            $result = array(
                "status"   => "success",
                "roleName" => strip_tags($_POST['role']),
                "roleId"   => $db->lastInsertId()
            );
        }
        else {
            $result = array(
                "status" => "error",
                "message" => "Role already exists."
            );
        }
        echo json_encode($result);
        break;
    case "deleteRole":
        $loggedUser = new ASUser(ASSession::get("user_id"));
        if(!$loggedUser->isAdmin()) exit(); 
        //default user roles can't be deleted
        if(in_array($_POST['roleId'], array(1,2,3)) )
            exit();
        $db->delete("as_user_roles", "role_id = :id", array(
            "id" => $_POST['roleId']
        ));
        $db->update("as_users", array( 'user_role' => "1" ), "user_role = :r", array( "r" => $_POST['roleId'] ) );
        break;

    default:
        break;
}

问题是，脚本是为了与ajax一起工作，它应该，用ajax重新加载页面，但不是，我在子域上运行这个脚本，我也有一个wordpress安装在主域，ajax工作得很好，但我不确定为什么不工作在这个脚本上，所以我决定也许重新加载页面后提交登录表单的问题将得到解决。

问题是，当我提交表单时，它只显示:"true"消息，但它不重新加载页面，如果我手动重新加载页面，所以它工作，我已经登录了。这就是问题所在。

我仍然是一个新手在整个编码的东西，但我努力，如果有任何其他的代码你需要，为了使这更清楚，我会尝试做它。