PSRs (PHP Standard Recommendations) huma sett ta' istandards ippubblikati mill-PHP-FIG (Framework Interoperability Group) li jiddefinixxu konvenzjonijiet komuni — stil tal-kodifikazzjoni, autoloading, u interfejċċi maqsuma — li jippermettu interoperabilità bejn frameworks, libreriji, u pakketti PHP differenti.
L-iktar importanti PSRs
PSR-1 / PSR-12 → CODING STYLE (basic + extended): naming, braces, indentation, etc.
PSR-4 → AUTOLOADING: namespace ↔ directory mapping (used by Composer)
PSR-3 → LoggerInterface: a common logging interface
PSR-7 → HTTP message interfaces (Request/Response objects)
PSR-11 → ContainerInterface: a common DI container interface
PSR-15 → HTTP middleware interface
PSR-6 / PSR-16 → Caching interfaces
PSR-18 → HTTP client interface
