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<div class="section" id="psr-compliance">
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<h1>PSR Compliance<a class="headerlink" href="#psr-compliance" title="Permalink to this headline">¶</a></h1>
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<p>The <a class="reference external" href="http://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
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not a member of the FIG, we are compatible with a number of their proposals. This guide is meant to list the
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status of our compliance with the various accepted, and some draft, proposals.</p>
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<p><strong>PSR-1: Basic Coding Standard</strong></p>
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<p>This recommendation covers basic class, method, and file-naming standards. Our
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<cite>style guide <https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/styleguide.rst>_</cite>
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meets PSR-1 and adds its own requirements on top of it.</p>
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<p><strong>PSR-2: Coding Style Guide</strong></p>
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<p>This PSR was fairly controversial when it first came out. CodeIgniter meets many of the recommendations within,
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but does not, and will not, meet all of them.</p>
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<p><strong>PSR-3: Logger Interface</strong></p>
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<p>CodeIgniter’s <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>
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<p>This PSR provides a method for organizing file and namespaces to allow for a standard method of autoloading
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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 Interface</strong></p>
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<p>CodeIgniter will not be trying to meet this PSR, as we believe it oversteps its needs. The newly proposed
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<a class="reference external" href="https://github.com/dragoonis/fig-standards/blob/psr-simplecache/proposed/simplecache.md">SimpleCache Interfaces</a>
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do look like something we would consider.</p>
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<p><strong>PSR-7: HTTP Message Interface</strong></p>
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<p>This PSR standardizes a way of representing the HTTP interactions. While many of the concepts became part of our
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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
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and we will get it fixed, or submit a pull request with the required changes.</p>
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