PHP Slim Framework initial experience of inaccessible controller

Talk not much, first put the error posted:

Just started with the slim framework, after setting up the auto-loading files and routing files, I wrote a controller:

<?PHP Use\psr\http\message\serverrequestinterface asRequest; Use\psr\http\message\responseinterface asResponse; Use\interop\container\containerinterface;classHomeController {protected $app;  Public function__construct (containerinterface$ci)    {        $this->app =$ci; }     Public functionIndex (Request$request, Response$response,$args)    {        Echo' Congratulations on your successful visit '; }}

and set up a route that points the index in the route to the index method in the home controller:

$app->get ('/index ', ' homecontroller:index ');

Originally want to when I visit Http://localhost/slimtest1/public/index.php/index, should print out the index method inside the text only to

I didn't expect to report the mistake I put out at the beginning.

It took a long time to find out it was my composer.json. There is no automatic load path specified, so I added the following code:

{    "require": {        "Slim/slim": "^3.0"    },    "AutoLoad": {         "Classmap": [            "App/controllers"        ]    }}

The shaded section above is the newly added code that specifies the controller to go to the App/controllers folder under load.

Then execute the composer install update just fine.

Successful results:

The reason for this is that I'm not quite familiar with composer's development model. Not sure how to manage the Composer.json file

PHP Slim Framework initial experience of inaccessible controller