A PHP codebase containing PSR-0 namespaces.
Why Upgrade to PSR-4?
The PSR-0 was deprecated in 2014. PSR-4 is now recommended. Furthermore, PSR-0 perpetuates dated practices found in earlier versions of PHP. Unless you need to support PHP versions older than PHP 5.3, you should upgrade to PSR-4 to follow modern PHP practices and improve forward compatibility.
The PSR-4 Shift upgrades any PSR-0 namespace to a PSR-4 namespace, including:
- Migrating folder structure.
- Upgrading any underscored class name references.
- Configuring composer