PHP匿名函数，使用关键字和变量范围问题

作为参考，我使用的是 SLIM 框架

我的问题是您在下面的代码中看到注释掉的print_r命令。 出于某种原因，变量在 ！in_array 函数之前显示正确的值。 我不确定发生了什么，但是当您将变量$allowedUserTypes传递到该函数中时，它似乎使用了（我猜该变量的旧版本来自某个地方）不正确的值。 不确定这怎么可能，因为它在该函数之前工作??. 我猜存在某种范围问题，或者我误解了匿名函数中"USE"关键字的使用。

$validate_user = function ($allowedUserTypes, $templateFolder = 'api'){
    return function() use ($allowedUserTypes, $templateFolder){
        global $app, $settings, $user, $device;
        set_template_directory($templateFolder);
        $errors = array();
        $validated = true;//assumed valid until proven false.
        //check session variables only if not token api call
        if($app->request()->params('token') == ''){
            //Check for expiration date hack
            if($_SESSION['remember']==false){
                $now = new DateTime();
                $now->modify("-30 minutes");
            }else{
                $now = new DateTime();
                $now->modify("-14 days");
            }
            //If the cookie still exists then it might have a time value in it.  See if it's set.
            if(isset($_SESSION['time'])){
                //If time now (minus minute) is greater than the session time then hack attempted.
                if($now > $_SESSION['time']){ 
                    $errors["errors"]["generic"][] = "Permission denied.  Cookie expired.";
                    $validated = false;
                    unset($_SESSION['time']);
                    unset($_SESSION['remember']);
                    unset($_SESSION['userid']);
                    unset($user);
                }
            }
        }
        if(isset($user)){
            $usertype = Usertype::find_by_id($user->usertype_id);//get all usertypes
            //print_r($allowedUserTypes); --> shows Admin, Manager, Franchise Admin, Franchise Manager
            if(!in_array($usertype->name,$allowedUserTypes)){
                //print_r($allowedUserTypes); --> shows only Admin, Manager ??
                $errors["errors"]["generic"][] = "Permission denied for user type :".$usertype->name;
                $validated = false;
            }
        }else{
            $errors["errors"]["generic"][] = "Permission denied.  User not logged in.  Please log in and try again.";
            $validated = false;
        }
        if($validated==false){
            $errors["command"] = "Error";
            $errors['message'] = "User could not be validated.";
            if($templateFolder=='templates'){
                $app->render('shared/header.php',       array('settings' => $settings));
                $app->render($device.'/header.php',     array('settings' => $settings, 'pagetitle'  => 'Pool Service USA | Error Page', 'user' => $user));
                $app->render($device.'/error.php',      array('settings' => $settings, 'errors' => $errors,'device' => $device));
                $app->render($device.'/footer.php',     array('settings' => $settings));
                $app->render('shared/footer.php',       array('settings' => $settings));
            }else{ //API Based Errors
                $app->render('shared/error.php', array(
                    'settings'  => $settings,
                    'errors'    => $errors,
                    'device'    => $device
                ));
            }
            $app->stop();//stop rendering to this point.
        }
    };
};

我将在调用此函数之前和之后显示用于调用此函数的 2 行，以防与它有任何关系。

$app->map('/api/remove-user'                        ,'get_user',$validate_user(array('Admin','Manager','Franchise Admin','Franchise Manager')),$remove_record_for_class('User'))                                ->via('GET', 'POST');
$app->map('/api/view-user'                          ,'get_user',$validate_user(array('Admin','Manager','Franchise Admin','Franchise Manager')),$view_results_for_class('User'))                                 ->via('GET', 'POST');

任何建议不胜感激！