PSR Compliance

The PHP-FIG was created in 2009 to help make code more interoperable between frameworksby ratifying Interfaces, style guides, and more that members were free to implement or not. While CodeIgniter isnot a member of the FIG, we are compatible with a number of their proposals. This guide is meant to list thestatus of our compliance with the various accepted, and some draft, proposals.

PSR-1: Basic Coding Standard

This recommendation covers basic class, method, and file-naming standards. Ourstyle guidemeets PSR-1 and adds its own requirements on top of it.

PSR-2: Coding Style Guide

This PSR was fairly controversial when it first came out. CodeIgniter meets many of the recommendations within,but does not, and will not, meet all of them.

PSR-3: Logger Interface

CodeIgniter’s Logger implements all of the interfaces provided by this PSR.

PSR-4: Autoloading Standard

This PSR provides a method for organizing file and namespaces to allow for a standard method of autoloadingclasses. Our Autoloader meets the PSR-4 recommendations.

PSR-6: Caching Interface

CodeIgniter will not be trying to meet this PSR, as we believe it oversteps its needs. The newly proposedSimpleCache Interfacesdo look like something we would consider.

PSR-7: HTTP Message Interface

This PSR standardizes a way of representing the HTTP interactions. While many of the concepts became part of ourHTTP layer, CodeIgniter does not strive for compatibility with this recommendation.

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If you find any places that we claim to meet a PSR but have failed to execute it correctly, please let us knowand we will get it fixed, or submit a pull request with the required changes.