WordPress Coding Standards clash with PSR-4 autoloading

[dotherightthing]

// src/Plugin.php
namespace DoTheRightThing\WPDTRT_Plugin\r_1_4_15;

// src/Plugin.php
class Plugin { ... }

// wpdtrt-test.php
class WPDTRT_Test_Plugin extends DoTheRightThing\WPDTRT_Plugin\r_1_4_15\Plugin {}

WordPress Coding Standards

src/class-plugin.php

Filenames should be all lowercase with hyphens as word separators. Class file names should be based on the class name with class- prepended Source: Make WordPress: Naming Conventions

PSR-4

src/Plugin.php

The terminating class name corresponds to a file name ending in .php. The file name MUST match the case of the terminating class name. Source: PSR-4: Autoloader

The PSR-4 standard must be matched, otherwise the autoloader won't be able to load the files associated with the classes, resulting in Class not found.

[dotherightthing]

See:

• https://wordpress.stackexchange.com/questions/166586/how-to-name-files-of-namespaced-classes
• Possible solution - https://github.com/pablo-sg-pacheco/wp-namespace-autoloader