-- SUMMARY -- This module implements a simple PSR-4 class autoloader for Drupal modules and profiles. Take a look at the following examples for classes and where PSR-4 tries to find their declaration. Drupal\your_module\YourClass -> your_module/lib/YourClass.php Drupal\your_module\SomeInterface -> your_module/lib/SomeInterface.php Drupal\your_module\Namespace\Class -> your_module/lib/Namespace/Class.php Drupal\your_profile\SomeClass -> profiles/your_profile/lib/SomeClass.php -- REQUIREMENTS -- * Requires PHP >= 5.3.0 for namespaces to work. -- INSTALLATION -- * Install as usual, see https://drupal.org/node/895323 for further information. * Works as soon as the module is enabled without further configuration. -- FAQ -- Q: Why is it called psr0 if it implements PSR-4? A: At the time of it's writing PSR-0 was the standard used by Drupal 8, but it soon changed to PSR-4 after that. Module short-names can only be set once. So I'm stuck with psr0.