Slim 3 how to use logger inside middleware function - php

Question

I have written this router after creating everything using the official:
$ php composer.phar create-project slim/slim-skeleton [my-app-name]
this is my routes.php file
<?php
require_once(__DIR__."/../bootstrap.php");
// Routes
class OwnsPost
{
/**
* Example middleware invokable class
*
* #param \Psr\Http\Message\ServerRequestInterface $request PSR7 request
* #param \Psr\Http\Message\ResponseInterface $response PSR7 response
* #param callable $next Next middleware
*
* #return \Psr\Http\Message\ResponseInterface
*/
public function __invoke($request, $response, $next)
{
if($request->getQueryParams() && $request->getQueryParams()['pid']){
$pid = intval($request->getQueryParams()['pid']);
if($pid == 0){
$this->logger->info("illegal pid call");
return false;
}
$cpost = get_post($pid);
if($cpost->post_author != get_current_user()){
$this->logger->info("wrong current user, tried accessing postid " . $cpost->ID . " with user ". get_current_user());
return false;
}
}else{
$this->logger->info("illegal pid call");
return false;
}
// $response->getBody()->write('BEFORE');
$response = $next($request, $response);
// $response->getBody()->write('AFTER');
return $response;
}
}
$app->get('/campaignedit/setcharitable/{id}', function ($request, $response, $id) {
// Sample log message
$this->logger->info("setcharitable '/' route " . $id);
// Render index view
return $this->renderer->render($response, 'index2.php', $id);
})->add( new OwnsPost() );
$this->logger works in the routing section, but not in the middleware section.
I get an
Fatal error: Call to a member function info() on a non-object in
/var/www/html/japi/src/routes.php on line 33

Answer 1

There is no member variable $logger in your middleware class. So, first add one.
protected $logger;
Next, add a constructor that accepts $logger as an argument.
public function __construct($logger)
{
$this->logger = $logger;
}
Last, when you initialize your middleware, pass the instance of your Logger.
$ownsPost = new OwnsPost($this->logger);

Answer 2

I need obviously to call to
global $app