CakePHP class not found using a custom class - php

Question

I just started using CakePHP 3. I'm trying to get up and running but doing the simplest of things is proving to be a headache.
I have a class, MySimpleClass, in src/App/MySimpleClass.php
<?php
namespace MyApp\MyNamespace;
class MySimpleClass {
public function aSimpleFunction() {
return 1;
}
}
And in my controller:
<?php
namespace App\Controller;
use Cake\Controller\Controller;
use MyApp\MyNamespace\MySimpleClass;
class MyFirstController extends Controller {
public function display() {
$mySimpleClass = new MySimpleClass();
echo $mySimpleClass->aSimpleFunction();
}
}
But this always gives me:
Error in: ROOT/src/Controller/TestController.php, line 10 Class 'MyApp\MyNamespace\MySimpleClass' not found
I use bin/cake server to run the HTTP server
I added App::className('MyApp\MyNamespace\MySimpleClass'); to bootstrap.php to see if that'd make a difference but it doesn't.
I've run composer dump-autoload on several occasions.
I tried putting MySimpleClass into global namespace but it still gave me the error.
PHPStorm isn't giving me any syntax or naming errors.

Answer 1

You should place your controllers in:
src/Controller
and use:
namespace App\Controller;

Answer 2

Nevermind, I finally found the solution...
I just had to add src to the classmap in composer.json:
"autoload": {
"classmap": [
"src"
],
...,
}
Edit:
Instead of abusing classmap, I just moved my class files to a directory outside of src

Answer 3

If your class is in the file src/App/MySimpleClass.php, the namespace has to be App\App. The first App refers to the root namespace of every CakePHP 3.x application, the second App refers to the subdirectory within the src directory you put your class file into.
If the namespace of the class should be App\MyNamespace, your classfile has to be located in src/MyNamespace.
Also: according to the error message you quoted, your MyFirstController is in a file called TestController.php. Instead, it should be MyFirstController.php. I recommend giving https://book.cakephp.org/3.0/en/intro/conventions.html#file-and-class-name-conventions a read regarding this topic.