A significant change is coming down the pipe for Drupal 8 development. PSR-4 support is here! In the long term it will be the defacto standard for autoloading classes from file paths in Drupal 8. Prior to this Changeset Notification Drupal 8 supported PSR-0 autoloading.
PSR-4 is the 4th PHP Standards Recommendation from the PHP Framework Interop Group (FIG). PHP-FIG seeks to be a cross-section of PHP developer ecosystem all weighing in their thoughts and best practices as Standards adoptable by the whole PHP community at large.
What does PSR-4 mean for your Drupal 8 coding endeavors, well let’s take a look at a sample directory structure of a module:
/modules/my_module/my_module.info.yml /modules/my_module/lib/Drupal/my_module/MyModuleClass.php /modules/my_module/lib/Drupal/my_module/Entity/MyEntity.php # Plugin /modules/my_module/lib/Drupal/my_module/Tests/MyEntityTest.php # Simpletest /modules/my_module/tests/Drupal/my_module/Tests/Entity/MyEntityTest.php # PHPUnit
/modules/my_module/my_module.info.yml /modules/my_module/src/MyModuleClass.php /modules/my_module/src/Entity/MyEntity.php # Plugin /modules/my_module/src/Tests/MyEntityTest.php # Simpletest /modules/my_module/tests/src/Entity/MyEntityTest.php # PHPUnit
Basically, autoloaded classes are moved directly into the ./src subdirectory. This applies to all classes in your namespace. Classes in sub-namespaces are retained in subdirectories as-is.
For the meantime while Drupal 8 is in development PSR-0 and PSR-4 support will exist in Core for a brief period. But, in the long term PSR-0 will be phased out and PSR-4 is to be the standard. If you want to keep track of how long you may have PSR-0 code laying around track this issue #2247287: [PP-2] Drop automatic PSR-0 support for modules
It’s great to see Drupal moving forward!
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