I have a namespacing notification on the PhpStorm IDE and I can’t see how to resolve it.

IDE

• PhpStorm 2023.1

Structure

I have a class amongst various other classes by other vendors, my class sits in this folder:

/home/classes/vendor/namespaceOuter/namespaceInner/subnamespace

The autoloader.php file sits in /home/classes/

My class file sits inside the above folder, and is ClassFile.php. Within, this has the namespace set out as here:

<?php
Namespace namespaceOuternamespaceInnersubnamespaceClassFile;

use exception;
use PDOexception;

class ClassFile {
      ... 
}

Problem

The PhpStorm IDE tells me:

Namespace name doesn’t match the PSR-0/PSR-4 project structure

NOT a problem

• The autoloader works perfectly.
• The class and its children and peers all work perfectly on the live website, the issue seems purely with the IDE informing me we’re not following the PSR-0/PSR-4 .

Attempted Solutions

• I have tried to change the namespace to make it call from root (namespaceOuternamespaceInnersubnamespaceClassFile;) within the Class file but this doesn’t remove the notification.

• I have tried to use the suggested fix by the IDE which in fact makes a bunch of new child folders in the current class’ folder (/home/classes/vendor/namespaceOuter/namespaceInner/subnamespace/namespaceOuter/namespaceInner/subnamespace/ClassFile.php) which is clearly impractical and wrong.

• Other established classes (such as PHPMailer) within the vendor/ folder do not have the same notice on their class files.

Reading

I have read the PHP Namespacing documentation as well as the PSR-4 documentation which includes this example:

While this IS NOT a Symfony project, the inconsistency between qualified namespace and file path implies this is not an issue.

Question

Is this namespacing incorrect somehow or is there an issue with the PHPStorm IDE suggestion (I believe so) — if so, how can I check/ update / confirm / fix this?

Thanks