如何在PHP中实现动态绑定？

我正在尝试用PHP开发一个小的MVC站点来处理密码。（没有类似于Laravel或类似的框架，用于学习目的）

为此，我至少编写了4个类和一个索引文件：

控制器->要扩展的基类，包含控制器的所有基本逻辑

索引->一个控制器类，用于处理普通用户的登录

Admin->一个控制器类，用于处理管理员用户的登录

引导->一个解释传递的url并用作路由器的类

这些类别如下所示：

libs/Controller.php

<?php

class Controller {

    protected $view;
    protected $security_level;

    function __construct() {
        $this->security_level = 0;
    }

    public function model($model) {
        $path = 'models/' . ucfirst($model). '.php';
        if (file_exists($path)) {
            require_once ($path);
            return new $model();
        }   
    }

    public function getSecurityLevel(){
        return $this->securiy_level;
    }

    public function view($view, $data = []){
        require_once('views/commom/header.php');
        require_once('views/' . $view . '.php');
        require_once('views/commom/footer.php');
    }

}

这是我的实际退出，当我尝试访问页面“”时：

对象（索引）#2（2）{[“视图”：受保护]=>NULL [“安全级别”：受保护]=>int（0）}

数组（12）{[0]=>string（11）“\uu构造”[1]=>string（5）“索引” [2] =>字符串（5）“管理员”[3]=>字符串（5）“登录”[4]=>字符串（9） “登录”[5]=>string（6）“登录”[6]=>string（6）“注销”[7]=> 字符串（14）“lostMyPassword”[8]=>字符串（7）“详细信息”[9]=>字符串（5） “模型”[10]=>string（16）“getSecurityLevel”[11]=>string（4）“视图”}

**注意：第21行的/var/www/html/libs/Controller.php中未定义的属性：索引：：$securiy_level**NULL

**注意：第21行的/var/www/html/libs/Controller.php中未定义的属性：索引：：$securiy_level**NULL

我无法理解的是PHP如何向我显示

$controller

变量具有我想要访问的属性，我有进行访问的方法，但我无法访问。当PHP显示“Index:：$securiy_level”时，什么是“静态”绑定

我知道PHP中的作用域（至少有一点）。 我打算在控制器类中使用变量“$security_level”，为所有子控制器提供一个默认值。如果程序员不想显式声明$security_level的不同值，他/她不必担心，只需使用父亲的属性即可

我的配置是：PHP7，Ubuntu 16，apache2

任何帮助我都会提前感谢

如果我的问题不清楚，请也发表评论以澄清任何问题

*Obs.：请注意，当我尝试访问“”时，输出为：

对象（管理）#2（4）{[“加密单元”：“管理”：私有]=> 对象（加密机）#3（2）{[“加密机密钥”：“加密机”：专用]=> 字符串（20）“RmUzYm1hcUxnY3ZYcA=” [“加密算法”：“加密机”：专用]=>string（11）“aes-256-cbc”} [“视图”：受保护]=>NULL[“安全级别”：受保护]=>int（0） [“安全级别”]=>int（1）}

数组（11）{[0]=>string（11）“\uu构造”[1]=>string（5）“索引” [2] =>字符串（6）“创建”[3]=>字符串（7）“恢复”[4]=>字符串（6） “更新”[5]=>string（17）“更新凭据”[6]=>string（6）“删除” [7] =>字符串（6）“搜索”[8]=>字符串（5）“模型”[9]=>字符串（16） “getSecurityLevel”[10]=>字符串（4）“视图”}int（1）int（1）

---

控制器中有一个输入错误，

return$this->securiy\u level应该是
返回$this->security\u级别；）
 很抱歉，但我很怀疑有人会看完这一切。请尝试将您的问题缩小到特定的范围，并确保所包含的代码与特定的问题相关。这是一堵巨大的代码墙，供人们尝试和通过。请创建一个，我们可以看看你。天哪，我不相信这个愚蠢的错误是造成这么多的困惑，为我。！！！非常感谢@Rarst。@Rarst打字错误应该以适当的理由（在“主题外”下）结束，并附上一条评论。@PatrickQ明白了，我不太熟悉如此接近的理由，不知道那个：）
<?php

class Index extends Controller {

    public function __construct() {
        parent::__construct();
        $this->model('UserModel');
        //$this->securiy_level = 0;
    }

    public function index($error = 0) {
        $this->view('index/index', ['error' => $error]);
    }

    public function admin($error = 0) {
        $this->view('index/index_adm', ['error' => $error]);
    }

    public function login(){
        $auth = new Authentication();
        $permission = $auth->authenticate("user");
        if($permission){
            header("location: /account/index");
        }
        else{
            $this->index(1);
        }
    }

    public function login_adm(){
        $auth = new Authentication();
        $permission = $auth->authenticate("admin");
        if($permission){
            header("location: /admin/index");
        }
        else{
            $this->admin(1);
        }
    }

    public function signin(){
        echo "method sign in invoked <br />";
    }

    public function logout(){
        $this->view('index/logout');
    }

    public function lostMyPassword(){
        echo "method lost invoked <br />";  
    }

    public function details() {
        $this->view->view('index/index');
    }

}

<?php

//I Think that this is VERY wrong, but okay
@session_start();

class Admin extends Controller {

    private $encrypt_unit;

    public function __construct() {
        parent::__construct();
        $this->model('UserModel');
        $this->encrypt_unit = new Encrypter();
        $this->securiy_level = 1;
    }

    public function index($msg = "", $err = false){
        $users = $this->recover();
        $this->view('admin/index', ["msg" => $msg, "err" => $err, "users" => $users]);
    }

    public function create(){
        $user_var = new UserModel();
        $user_var->setLogin($_POST["login"]);
        $user_var->setEmail($_POST["email"]);
        $user_var->setPassword($this->encrypt_unit->encrypt($_POST["password"]));
        $user_var->setIsAdmin($_POST["isAdmin"]);

        $user_dao = new UserDAO();
        $flag = $user_dao->insertUser($user_var);

        if($flag)
            $this->index("User created successfully", false);
        else
            $this->index("Can't created user, please try again", true);
    }

    public function recover(){
        $user_dao = new UserDAO();
        $all_users = $user_dao->getUsers();

        $users = array();
        foreach ($all_users as $value) {
            array_push($users, [
            "id" => $value->getId(),
            "login" => $value->getLogin(),
            "email" => $value->getEmail(),
            "password" => $this->encrypt_unit->decrypt($value->getPassword()),
            "isAdmin" => $value->getIsAdmin()
            ]);
        }

        return $users;
    }

    public function update(){
        $user_var = new UserModel();
        $user_var->setId($_POST["id"]);
        $user_var->setLogin($_POST["login"]);
        $user_var->setEmail($_POST["email"]);
        $user_var->setPassword($this->encrypt_unit->encrypt($_POST["password"]));

        $user_dao = new UserDAO();
        $flag = $user_dao->updateUser($user_var);

        if($flag)
            $this->index("User updated successfully", false);
        else
            $this->index("Can't updated user, please try again", true);
    }

    public function update_credential($credential_level){
        $user_var = new UserModel();
        $user_var->setId($_POST["id"]);
        $user_var->setIsAdmin($credential_level);

        $user_dao = new UserDAO();
        $flag = $user_dao->updateUserCredential($user_var);

        if($flag)
            $this->index("User updated successfully", false);
        else
            $this->index("Can't updated user, please try again", true);
    }

    public function delete(){
        $user_var = new UserModel();
        $user_var->setId($_POST["id"]);

        $user_dao = new UserDAO();
        $flag = $user_dao->deleteUser($user_var);

        if($flag)
            $this->index("User deleted successfully", false);
        else
            $this->index("Can't deleted user, please try again", true);
    }

    public function search(){
        echo "method search invoked <br />";
    }

}

<?php

class Bootstrap {

    // protected $controller;
    // protected $method;
    // protected $params;

    function __construct() {
        //$this->method = 'index';
        $this->redirect();
    }

    public function parseUrl(){

        return isset($_GET['url']) ? explode('/',filter_var(rtrim($_GET['url'], '/'), FILTER_SANITIZE_URL)) : null;
    }

    function redirect(){

        $controller;
        $method;
        $params;

        $url = $this->parseUrl();

        if(empty($url[0])){
            $controller_name = 'Index';
        }
        else{
            $controller_name = ucfirst($url[0]);
        }

        $filename_controller = 'controllers/' . $controller_name . '.php';

        if (file_exists($filename_controller)) {
            require_once($filename_controller);
            // Do this to use the rest of array to select method, and than parameters
            unset($url[0]);
        }
        else{
            $this->error("Controller $controller_name not founded");
            return false;
        }

        $controller = new $controller_name;

        //default method
        $method = 'index';

        if(isset($url[1])){
            if (method_exists($controller, $url[1])) {
                $method = $url[1];
                // Do this to use the rest of array to select parameters
                unset($url[1]);
            }
            else{
                $this->error("The controller $controller_name doesn't have any public method called $url[1]");
            }
        }

        //This 'array_values($url)' command is possible because we have unseted the first and second position of this aray before
        $params = $url ? array_values($url) : [];

        // Securiy comparassion?
        var_dump($controller);
        var_dump(get_class_methods($controller));
        var_dump($controller->getSecurityLevel());
        var_dump($controller->{"getSecurityLevel"}());
        // if(property_exists($controller, "securiy_level")){
        //  $authEntity = new Authentication();
        //  $authEntity->auth($controller->getSecurityLevel());
        // }

        //(new $url[0])->{$url[1]}($url[2]);
        call_user_func_array([$controller, $method], $params);
    }

    function error($msg="") {
        //echo "error invoked: <br /> $msg <br />";
        require_once('controllers/Error.php');
        $errorHandler = new ErrorController();
        $errorHandler->index();
        return false;
    }

}

<?php

// Use an autoloader!
require_once('libs/Bootstrap.php');
require_once('libs/Controller.php');
require_once('libs/Model.php');
require_once('libs/View.php');

// Library
require_once('libs/Database.php');
require_once('libs/ConnectionDB.php');
require_once('libs/Session.php');
require_once('libs/Authentication.php');
require_once('libs/Encrypter.php');

require_once('config/paths.php');
require_once('config/database.php');
require_once('config/passwords.php');

// DAOS
require_once('daos/UserDAO.php');
require_once('daos/AccountDAO.php');


$app = new Bootstrap();

var_dump($controller->getSecurityLevel()); //or
var_dump($controller->{"getSecurityLevel"}());