无法在PHP中注销

问题描述：

我正在尝试使用PHP进行注册/登录，但是我无法注销.我不断收到以下错误.

I'm trying to make a signup / sign-in form in PHP, but I have trouble logging out. I keep getting the following error.

致命错误:未捕获ArgumentCountError:函数USER :: __ construct()的参数太少，第4行的C:\ xampp \ htdocs \ recepten \ logout.php中传递了0，而在C:\ xampp \ htdocs中恰好期望了1 \ recepten \ class.user.php:6堆栈跟踪:#0 C:\ xampp \ htdocs \ recepten \ logout.php(4):USER-> __ construct()#1 {main}放入C:\ xampp \ htdocs \ recepten \ class.user.php在第6行

Fatal error: Uncaught ArgumentCountError: Too few arguments to function USER::__construct(), 0 passed in C:\xampp\htdocs\recepten\logout.php on line 4 and exactly 1 expected in C:\xampp\htdocs\recepten\class.user.php:6 Stack trace: #0 C:\xampp\htdocs\recepten\logout.php(4): USER->__construct() #1 {main} thrown in C:\xampp\htdocs\recepten\class.user.php on line 6

有人可以建议我做些什么以及如何解决该问题吗?

Can somebody advise me on what I'm doing what and how to fix the problem?

这是我的注销脚本代码行:

This is my line of code for the logout script:

<?php
session_start();
require_once 'class.user.php';
$user = new USER();

if(!$user->is_logged_in())
{
    $user->redirect('indexlogin.php');
}

if($user->is_logged_in()!="")
{
    $user->logout(); 
    $user->redirect('indexlogin.php');
}
?>

这是我的呼叫用户脚本代码:

This is my code for the call-user script:

<?php
class USER
{
    private $db;

    function __construct($DB_con)
    {
        $this->db = $DB_con;
    }

    public function register($fname,$lname,$uname,$umail,$upass)
    {
       try
       {
           $new_password = password_hash($upass, PASSWORD_DEFAULT);

           $stmt = $this->db->prepare("INSERT INTO users(user_name,user_email,user_pass) 
                                                       VALUES(:uname, :umail, :upass)");

           $stmt->bindparam(":uname", $uname);
           $stmt->bindparam(":umail", $umail);
           $stmt->bindparam(":upass", $new_password);            
           $stmt->execute(); 

           return $stmt; 
       }
       catch(PDOException $e)
       {
           echo $e->getMessage();
       }    
    }

    public function login($uname,$umail,$upass)
    {
       try
       {
          $stmt = $this->db->prepare("SELECT * FROM users WHERE user_name=:uname OR user_email=:umail LIMIT 1");
          $stmt->execute(array(':uname'=>$uname, ':umail'=>$umail));
          $userRow=$stmt->fetch(PDO::FETCH_ASSOC);
          if($stmt->rowCount() > 0)
          {
             if(password_verify($upass, $userRow['user_pass']))
             {
                $_SESSION['user_session'] = $userRow['user_id'];
                return true;
             }
             else
             {
                return false;
             }
          }
       }
       catch(PDOException $e)
       {
           echo $e->getMessage();
       }
   }

   public function is_loggedin()
   {
      if(isset($_SESSION['user_session']))
      {
         return true;
      }
   }

   public function redirect($url)
   {
       header("Location: $url");
   }

  public function logout()
  {
      session_destroy();
      $_SESSION['user_session'] = true;
  }
}
?>

如果有人可以帮助，那就太好了！

It would be nice if someone could help!

答

在class.user.php中，您有一个:

function __construct($DB_con)
{
  $this->db = $DB_con;
}

，以及在logout.php中使用它的时间:

and when you use it in logout.php:

$user = new USER();

您必须将$DB_con传递给__constructor，或创建一个没有参数的__constructor，并添加另一个函数来初始化DB:

You have to pass the $DB_con to __constructor, or create a __constructor that has no arguments, and add another function to initialize the DB:

function __construct()
{
} 
public function initDB($DB_con)
{
  $this->db = $DB_con;
}

然后您可以像这样使用它:

and then you can use it like that:

$YourDB = whatever_get_DB();
$user = new USER();
// And when you need:
$user.initDB($YourDB);

或仅此一项:

$YourDB = whatever_get_DB();
$user = new USER($YourDB);

无法在PHP中注销

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