Bug: Cannot instantiate interface

[Salman98]

PHP Version

8.1

CodeIgniter4 Version

4.2.6

CodeIgniter4 Installation Method

Manual (zip or tar.gz)

Which operating systems have you tested for this bug?

Linux

Which server did you use?

fpm-fcgi

Database

No response

What happened?

Error : Cannot instantiate interface .

I have following files

• UserInterface
• UserRepository

• HomeController

• userInterface

  interface UserInterface
  {
  public function login(string $name, string $password);
  }

  UserRepository

  class UserRepository implements UserInterface {
  
  public function login(string $name, string $password)
  {
      return "ok";
  }
  }

HomeController

 class Home extends BaseController
{
    public function __construct() 
    {
        $this->test = new UserInterface();
    }

    public function index ()
    {

        $this->test->login('username', 'password');

    }
}

In Config/AutoLoad.php I added these too

 public $classmap = [
     UserRepository::class => APPPATH . 'Repositories/Users/UserRepository.php',
     UserInterface::class => APPPATH .  'Interfaces/Users/UserInterface.php',
    ];

Steps to Reproduce

I have added code , if you try to follow it you will be able to reproduce it

Expected Output

the interface should work but it's not working

Anything else?

No response

[kenjis]

Sorry, PHP cannot instantiate interface. https://www.php.net/manual/en/language.oop5.interfaces.php

We use GitHub issues to track BUGS and to track approved DEVELOPMENT work packages. We use our forum to provide SUPPORT and to discuss FEATURE REQUESTS.

[Salman98]

Sorry, PHP cannot instantiate interface. https://www.php.net/manual/en/language.oop5.interfaces.php

We use GitHub issues to track BUGS and to track approved DEVELOPMENT work packages. We use our forum to provide SUPPORT and to discuss FEATURE REQUESTS.

I didn't find answer then I had no choice to post here . If you know already what i am missing then please let me know in future it might be useful for others too . Thanks

[kenjis]

As far as I know, interfaces cannot be instantiated. You must instantiate a concrete class that implements the interface.

[paulbalandan]

I think you mean to instantiate UserRepository, the concrete implementation of UserInterface.

class Home extends BaseController
{
   public function __construct() 
   {
-      $this->test = new UserInterface();
+      $this->test = new UserRepository();
   }

   public function index ()
   {

       $this->test->login('username', 'password');

   }
}