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<li class="toctree-l2"><a class="reference internal" href="../incoming/methodspoofing.html">HTTP Method Spoofing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../models/model.html">Using CodeIgniter's Model</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../models/entities.html">Using Entity Classes</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../dbmgmt/index.html">Managing Databases</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../dbmgmt/forge.html">Database Manipulation with Database Forge</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/honeypot.html">Honeypot Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/images.html">Image Manipulation Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/pagination.html">Pagination</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/uri.html">Working with URIs</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/user_agent.html">User Agent Class</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../libraries/validation.html">Validation</a></li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/filesystem_helper.html">Filesystem Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/test_helper.html">Test Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/overview.html">Getting Started</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/database.html">Database</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/fabricator.html">Generating Data</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/controllers.html">Controller Testing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/feature.html">HTTP Testing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/response.html">Testing Responses</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/benchmark.html">Benchmarking</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/debugging.html">Debugging Your Application</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../testing/mocking.html">Mocking</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_controllers.html">Running Controllers via CLI</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/spark_commands.html">Spark Commands</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_commands.html">Creating Spark Commands</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../cli/cli_request.html">CLIRequest Class</a></li>
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<li class="toctree-l1"><a class="reference internal" href="../extending/index.html">Extending CodeIgniter</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="../extending/core_classes.html">Creating Core System Classes</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/common.html">Replacing Common Functions</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/events.html">Events</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/basecontroller.html">Extending the Controller</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/composer_packages.html">Creating Composer Packages</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../extending/contributing.html">Contributing to CodeIgniter</a></li>
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<a class="btn btn-neutral float-right" href="https://github.com/codeigniter4/CodeIgniter4/edit/develop/user_guide_src/source/installation/upgrade_configuration.rst">Edit this page</a>
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<li class="breadcrumb-item"><a href="upgrade_4xx.html">Upgrading from 3.x to 4.x</a></li>
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<li class="breadcrumb-item active">Upgrade Configuration</li>
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<section id="upgrade-configuration">
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<h1>Upgrade Configuration<a class="headerlink" href="#upgrade-configuration" title="Permalink to this headline"></a></h1>
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<div class="contents local topic" id="contents">
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<ul class="simple">
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<li><p><a class="reference internal" href="#documentations" id="id1">Documentations</a></p></li>
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<li><p><a class="reference internal" href="#what-has-been-changed" id="id2">What has been changed</a></p></li>
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<li><p><a class="reference internal" href="#upgrade-guide" id="id3">Upgrade Guide</a></p></li>
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<li><p><a class="reference internal" href="#code-example" id="id4">Code Example</a></p>
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<ul>
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<li><p><a class="reference internal" href="#codeigniter-version-3-x" id="id5">CodeIgniter Version 3.x</a></p></li>
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<li><p><a class="reference internal" href="#codeigniter-version-4-x" id="id6">CodeIgniter Version 4.x</a></p></li>
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</ul>
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</li>
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</ul>
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</div>
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<section id="documentations">
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<h2><a class="toc-backref" href="#id1">Documentations</a><a class="headerlink" href="#documentations" title="Permalink to this headline"></a></h2>
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<ul class="simple">
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<li><p><a class="reference external" href="http://codeigniter.com/userguide3/libraries/config.html">Config Documentation CodeIgniter 3.X</a></p></li>
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<li><p><a class="reference internal" href="../general/configuration.html"><span class="doc">Configuration Documentation CodeIgniter 4.X</span></a></p></li>
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</ul>
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</section>
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<section id="what-has-been-changed">
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<h2><a class="toc-backref" href="#id2">What has been changed</a><a class="headerlink" href="#what-has-been-changed" title="Permalink to this headline"></a></h2>
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<ul class="simple">
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<li><p>In CI4, the configurations are now stored in classes which extend <code class="docutils literal notranslate"><span class="pre">CodeIgniter\Config\BaseConfig</span></code>.</p></li>
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<li><p>The <strong>application/config/config.php</strong> in CI3 will be <strong>app/Config/App.php</strong>
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and some other files like <strong>app/Config/Security.php</strong> for the specific classes.</p></li>
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<li><p>Within the configuration class, the config values are stored in public class properties.</p></li>
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<li><p>The method to fetch config values has been changed.</p></li>
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</ul>
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</section>
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<section id="upgrade-guide">
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<h2><a class="toc-backref" href="#id3">Upgrade Guide</a><a class="headerlink" href="#upgrade-guide" title="Permalink to this headline"></a></h2>
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<ol class="arabic simple">
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<li><p>You have to change the values in the default CI4 config files according to the
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changes in the CI3 files. The config names are pretty much the same as in CI3.</p></li>
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<li><p>If you are using custom config files in your CI3 project you have to create those
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files as new PHP classes in your CI4 project in <strong>app/Config</strong>. These classes
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should be in the <code class="docutils literal notranslate"><span class="pre">Config</span></code> namespace and should extend <code class="docutils literal notranslate"><span class="pre">CodeIgniter\Config\BaseConfig</span></code>.</p></li>
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<li><p>Once you have created all custom config classes, you have to copy the variables
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from the CI3 config into the new CI4 config class as public class properties.</p></li>
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<li><p>Now, you have to change the config fetching syntax everywhere you fetch config
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values. The CI3 syntax is something like <code class="docutils literal notranslate"><span class="pre">$this->config->item('item_name');</span></code>.
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You have to change this into <code class="docutils literal notranslate"><span class="pre">config('MyConfig')->item_name;</span></code>.</p></li>
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</ol>
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</section>
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<section id="code-example">
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<h2><a class="toc-backref" href="#id4">Code Example</a><a class="headerlink" href="#code-example" title="Permalink to this headline"></a></h2>
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<section id="codeigniter-version-3-x">
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<h3><a class="toc-backref" href="#id5">CodeIgniter Version 3.x</a><a class="headerlink" href="#codeigniter-version-3-x" title="Permalink to this headline"></a></h3>
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<p>Path: <strong>application/config/site.php</strong>:</p>
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<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
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<span class="nb">defined</span><span class="p">(</span><span class="s1">'BASEPATH'</span><span class="p">)</span> <span class="k">OR</span> <span class="k">exit</span><span class="p">(</span><span class="s1">'No direct script access allowed'</span><span class="p">);</span>
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<span class="nv">$siteName</span> <span class="o">=</span> <span class="s1">'My Great Site'</span><span class="p">;</span>
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<span class="nv">$siteEmail</span> <span class="o">=</span> <span class="s1">'webmaster@example.com'</span><span class="p">;</span>
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</pre></div>
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</div>
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</section>
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<section id="codeigniter-version-4-x">
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<h3><a class="toc-backref" href="#id6">CodeIgniter Version 4.x</a><a class="headerlink" href="#codeigniter-version-4-x" title="Permalink to this headline"></a></h3>
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<p>Path: <strong>app/Config/Site.php</strong>:</p>
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<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o"><?</span><span class="nx">php</span>
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<span class="k">namespace</span> <span class="nx">Config</span><span class="p">;</span>
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<span class="k">use</span> <span class="nx">CodeIgniter\Config\BaseConfig</span><span class="p">;</span>
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<span class="k">class</span> <span class="nc">Site</span> <span class="k">extends</span> <span class="nx">BaseConfig</span>
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<span class="p">{</span>
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<span class="k">public</span> <span class="nv">$siteName</span> <span class="o">=</span> <span class="s1">'My Great Site'</span><span class="p">;</span>
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<span class="k">public</span> <span class="nv">$siteEmail</span> <span class="o">=</span> <span class="s1">'webmaster@example.com'</span><span class="p">;</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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