Php $\u POST变量在表单输入后为空

我正在尝试用php开发一个简单的登录系统，在完成了一些新手教程后，我提出了这个解决方案：

html格式的简单表单：

<form class = "form-horizontal" action = "{$BASE_URL}controllers/users/login.php" method = "POST">
                        <div class = "form-group">
                            <label for = "username" class = "col-sm-3 control-label">Username</label>
                            <div class = "col-sm-8">
                                <input type = "text" name = "username" class = "form-control" placeholder = "Username" required = "" autofocus = "" autocomplete = "off">
                            </div>
                        </div>

                        <div class = "form-group">
                            <label for = "password" class = "col-sm-3 control-label">Password</label>
                            <div class = "col-sm-8">
                                <input type = "password" name = "password" class = "form-control" placeholder = "Password" required = "" autocomplete = "off">
                            </div>
                        </div>

                        <div class = "form-group">
                            <div class = "col-sm-3 col-sm-offset-3">
                                <input type = "submit" class = "btn btn-primary" value = "Log In"></button>
                            </div>
                            <div class = "col-sm-5 text-right">
                                <a href = "" class = "small" data-toggle = "modal" data-target = "#forgotPassword"> Forgot Password?</a>
                            </div>
                        </div>
                    </form>

然后在提交我的登录信息后，我在我的login.php

<?php

var_dump($_POST);

我认为更改max_input_值的解决方案不会有任何区别，因为表单非常小，defaut值（1000）是可以接受的

我还有一个config.php文件，其中包括Smarty库，我认为这与我的问题无关

 <?php



include_once($BASE_DIR . 'lib/helpers/functions.php');
include_once($BASE_DIR . 'lib/helpers/Html.class.php');

include_once($BASE_DIR . 'lib/permissions/PagePermissions.class.php');
include_once($BASE_DIR . 'lib/permissions/Permission.class.php');
include_once($BASE_DIR . 'lib/permissions/AuthUser.class.php');
include_once($BASE_DIR . 'lib/permissions/GuestUser.class.php');
include_once($BASE_DIR . 'lib/permissions/AdminUser.class.php');
include_once($BASE_DIR . 'lib/permissions/ModUser.class.php');
include_once($BASE_DIR . 'lib/permissions/PagePermissions.class.php');
include_once($BASE_DIR . 'lib/permissions/ResourcePermission.class.php');

include_once ($BASE_DIR . '/lib/smarty/Smarty.class.php');


$smarty = new Smarty();
$smarty->template_dir = '../templates';
$smarty->compile_dir = '../templates_c';
$smarty->assign('BASE_URL', $BASE_URL);


$_SESSION['logged_in'] = isset($_SESSION['logged_in']) ? $_SESSION['logged_in'] : false;
$smarty->assign('LOGGED_IN', $_SESSION['logged_in']);

---

您的html表单可以将帖子发送到my login.php页面。您可以再次确认帖子的确切url吗？您的意思是：
/home/luiscosta/PhpstormProjects/LBAW-FEUP/controllers/users/login.php
，这可能不是url？所有这些都发生在您的login.php页面上吗？表单看起来很好，所以我假设它是其中之一
array(0) { }

 <?php



include_once($BASE_DIR . 'lib/helpers/functions.php');
include_once($BASE_DIR . 'lib/helpers/Html.class.php');

include_once($BASE_DIR . 'lib/permissions/PagePermissions.class.php');
include_once($BASE_DIR . 'lib/permissions/Permission.class.php');
include_once($BASE_DIR . 'lib/permissions/AuthUser.class.php');
include_once($BASE_DIR . 'lib/permissions/GuestUser.class.php');
include_once($BASE_DIR . 'lib/permissions/AdminUser.class.php');
include_once($BASE_DIR . 'lib/permissions/ModUser.class.php');
include_once($BASE_DIR . 'lib/permissions/PagePermissions.class.php');
include_once($BASE_DIR . 'lib/permissions/ResourcePermission.class.php');

include_once ($BASE_DIR . '/lib/smarty/Smarty.class.php');


$smarty = new Smarty();
$smarty->template_dir = '../templates';
$smarty->compile_dir = '../templates_c';
$smarty->assign('BASE_URL', $BASE_URL);


$_SESSION['logged_in'] = isset($_SESSION['logged_in']) ? $_SESSION['logged_in'] : false;
$smarty->assign('LOGGED_IN', $_SESSION['logged_in']);