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< li class = "breadcrumb-item active" > PSR Compliance< / li >
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< h1 > PSR Compliance< a class = "headerlink" href = "#psr-compliance" title = "Permalink to this heading" > < / a > < / h1 >
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< p > The < a class = "reference external" href = "https://www.php-fig.org/" > PHP-FIG< / a > was created in 2009 to help make code more interoperable between frameworks
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by ratifying Interfaces, style guides, and more that members were free to implement or not. While CodeIgniter is
not a member of the FIG, we are compatible with a number of their proposals. This guide is meant to list the
status of our compliance with the various accepted, and some draft, proposals.< / p >
< p > < strong > PSR-1: Basic Coding Standard< / strong > < / p >
< p > This recommendation covers basic class, method, and file-naming standards. Our
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< a class = "reference external" href = "https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/styleguide.md" > style guide< / a >
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meets PSR-1 and adds its own requirements on top of it.< / p >
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< p > < strong > PSR-12: Extended Coding Style< / strong > < / p >
< p > Our
< a class = "reference external" href = "https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/styleguide.md" > style guide< / a > follows the recommendation plus a set of our own styling conventions.< / p >
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< p > < strong > PSR-3: Logger Interface< / strong > < / p >
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< p > CodeIgniter’ < a class = "reference internal" href = "../general/logging.html" > < span class = "doc" > Logger< / span > < / a > implements all of the interfaces provided by this PSR.< / p >
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< p > < strong > PSR-4: Autoloading Standard< / strong > < / p >
< p > This PSR provides a method for organizing file and namespaces to allow for a standard method of autoloading
classes. Our < a class = "reference internal" href = "../concepts/autoloader.html" > < span class = "doc" > Autoloader< / span > < / a > meets the PSR-4 recommendations.< / p >
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< p > < strong > PSR-6: Caching Interfaces< / strong >
< strong > PSR-16: SimpleCache Interface< / strong > < / p >
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< p > While the framework Cache components do not adhere to PSR-6 or PSR-16, a separate set of adapters
are available from the CodeIgniter4 organization as a supplemental module. It is recommended that
projects use the native Cache drivers directly as the adapters are only intended for compatibility
with third-party libraries. For more information visit the < a class = "reference external" href = "https://github.com/codeigniter4/cache" > CodeIgniter4 Cache repo< / a > .< / p >
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< p > < strong > PSR-7: HTTP Message Interface< / strong > < / p >
< p > This PSR standardizes a way of representing the HTTP interactions. While many of the concepts became part of our
HTTP layer, CodeIgniter does not strive for compatibility with this recommendation.< / p >
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< p > —< / p >
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< p > If you find any places that we claim to meet a PSR but have failed to execute it correctly, please let us know
and we will get it fixed, or submit a pull request with the required changes.< / p >
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