Number Name Description Editor Coordinator Sponsor Status PSR-0 Autoloading Standard It describes the mandatory requirements that must be adhered to for autoloader interoperability.[3] N/A N/A N/A Deprecated and substituted by PSR-4[4] PSR-1 Basic Coding Standard It comprises what should be considered the standard coding elements that are required to ensure a high level of technical interoperability between shared PHP code.[5] N/A N/A N/A Accepted[4] PSR-2 Coding Style Guide It considers PSR-1 and it is intended to reduce cognitive friction when scanning code from different authors.