The problem with the thin controller: there must be an instance of ContainerInterface, an instance of Slim \\ Container

Question

I'm trying to use the controller in Slim, but still getting an error

PHP Catchable fatal error: argument 1 passed to TopPageController :: __ construct () must be an instance of ContainerInterface,
Slim \ Container instance specified

My index.php

<?php use \Psr\Http\Message\ServerRequestInterface as Request; use \Psr\Http\Message\ResponseInterface as Response; require '../vendor/autoload.php'; require 'settings.php'; spl_autoload_register(function ($classname) { require ("../classes/" . $classname . ".php"); }); $app = new \Slim\App(["settings" => $config]); $app->get('/', function (Request $request, Response $response) { $response->getBody()->write("Welcome"); return $response; }); $app->get('/method1', '\TopPageController:method1'); $app->run(); ?> 

My TopPageController.php

 <?php class TopPageController { protected $ci; //Constructor public function __construct(ContainerInterface $ci) { $this->ci = $ci; } public function method1($request, $response, $args) { //your code //to access items in the container... $this->ci->get(''); $response->getBody()->write("Welcome1"); return $response; } public function method2($request, $response, $args) { //your code //to access items in the container... $this->ci->get(''); $response->getBody()->write("Welcome2"); return $response; } public function method3($request, $response, $args) { //your code //to access items in the container... $this->ci->get(''); $response->getBody()->write("Welcome3"); return $response; } } ?> 

Thanks. I am using Slim 3.

Answer 1

Your code is apparently based on Slim 3 documentation at http://www.slimframework.com/docs/objects/router.html , which does not contain all the necessary code to throw an exception thrown.

Basically you have two options to make it work.

Option 1:

Import the namespace into index.php , as is done for Request and Response :

 use \Interop\Container\ContainerInterface as ContainerInterface; 

Option 2:

Change the constructor of TopPageController to:

 public function __construct(Interop\Container\ContainerInterface $ci) { $this->ci = $ci; } 

---

TL DR

The reason the exception is thrown is because the Slim\Container class uses the Interop\Container\ContainerInterface interface (see source code):

 use Interop\Container\ContainerInterface; 

Since Slim\Container extends Pimple\Container , everything should be a valid (working) type declaration for your controller method:

 public function __construct(Pimple\Container $ci) { $this->ci = $ci; } 

... or even...

 public function __construct(ArrayAccess $ci) { $this->ci = $ci; } 

Answer 2

Just paste the below code into the controller

 use \Psr\Http\Message\ServerRequestInterface as Request; use \Psr\Http\Message\ResponseInterface as Response; use \Interop\Container\ContainerInterface as ContainerInterface; 

The controller design should look below

 public function __construct(ContainerInterface $container) { parent::__construct($container); } 

I think you are mistaken in providing a name in the controller for ContainerInterface.