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<section id="server-requirements">
<h1>Server Requirements<a class="headerlink" href="#server-requirements" title="Permalink to this headline"></a></h1>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#php-and-required-extensions" id="id1">PHP and Required Extensions</a></p></li>
<li><p><a class="reference internal" href="#optional-php-extensions" id="id2">Optional PHP Extensions</a></p></li>
<li><p><a class="reference internal" href="#supported-databases" id="id3">Supported Databases</a></p></li>
</ul>
</div>
<section id="php-and-required-extensions">
<h2><a class="toc-backref" href="#id1">PHP and Required Extensions</a><a class="headerlink" href="#php-and-required-extensions" title="Permalink to this headline"></a></h2>
<p><a class="reference external" href="https://www.php.net/">PHP</a> version 7.4 or newer is required, with the following PHP extensions are enabled:</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://www.php.net/manual/en/intl.requirements.php">intl</a></p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/mbstring.requirements.php">mbstring</a></p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/json.requirements.php">json</a></p></li>
</ul>
</div></blockquote>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>The end of life date for PHP 7.4 was November 28, 2022. If you are
still using PHP 7.4, you should upgrade immediately. The end of life date
for PHP 8.0 will be November 26, 2023.</p>
</div>
</section>
<section id="optional-php-extensions">
<h2><a class="toc-backref" href="#id2">Optional PHP Extensions</a><a class="headerlink" href="#optional-php-extensions" title="Permalink to this headline"></a></h2>
<p>The following PHP extensions should be enabled on your server:</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://www.php.net/manual/en/mysqlnd.install.php">mysqlnd</a> (if you use MySQL)</p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/curl.requirements.php">curl</a> (if you use <a class="reference internal" href="../libraries/curlrequest.html"><span class="doc">CURLRequest</span></a>)</p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/imagick.requirements.php">imagick</a> (if you use <a class="reference internal" href="../libraries/images.html"><span class="doc">Image</span></a> class ImageMagickHandler)</p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/image.requirements.php">gd</a> (if you use <a class="reference internal" href="../libraries/images.html"><span class="doc">Image</span></a> class GDHandler)</p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/simplexml.requirements.php">simplexml</a> (if you format XML)</p></li>
</ul>
</div></blockquote>
<p>The following PHP extensions are required when you use a Cache server:</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://www.php.net/manual/en/memcache.requirements.php">memcache</a> (if you use <a class="reference internal" href="../libraries/caching.html"><span class="doc">Cache</span></a> class MemcachedHandler with Memcache)</p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/memcached.requirements.php">memcached</a> (if you use <a class="reference internal" href="../libraries/caching.html"><span class="doc">Cache</span></a> class MemcachedHandler with Memcached)</p></li>
<li><p><a class="reference external" href="https://github.com/phpredis/phpredis">redis</a> (if you use <a class="reference internal" href="../libraries/caching.html"><span class="doc">Cache</span></a> class RedisHandler)</p></li>
</ul>
</div></blockquote>
<p>The following PHP extensions are required when you use PHPUnit:</p>
<blockquote>
<div><ul class="simple">
<li><p><a class="reference external" href="https://www.php.net/manual/en/dom.requirements.php">dom</a> (if you use <a class="reference internal" href="../testing/response.html"><span class="doc">TestResponse</span></a> class)</p></li>
<li><p><a class="reference external" href="https://www.php.net/manual/en/libxml.requirements.php">libxml</a> (if you use <a class="reference internal" href="../testing/response.html"><span class="doc">TestResponse</span></a> class)</p></li>
<li><p><a class="reference external" href="https://xdebug.org/docs/install">xdebug</a> (if you use <code class="docutils literal notranslate"><span class="pre">CIUnitTestCase::assertHeaderEmitted()</span></code>)</p></li>
</ul>
</div></blockquote>
</section>
<section id="supported-databases">
<span id="requirements-supported-databases"></span><h2><a class="toc-backref" href="#id3">Supported Databases</a><a class="headerlink" href="#supported-databases" title="Permalink to this headline"></a></h2>
<p>A database is required for most web application programming.
Currently supported databases are:</p>
<blockquote>
<div><ul class="simple">
<li><p>MySQL via the <code class="docutils literal notranslate"><span class="pre">MySQLi</span></code> driver (version 5.1 and above only)</p></li>
<li><p>PostgreSQL via the <code class="docutils literal notranslate"><span class="pre">Postgre</span></code> driver (version 7.4 and above only)</p></li>
<li><p>SQLite3 via the <code class="docutils literal notranslate"><span class="pre">SQLite3</span></code> driver</p></li>
<li><p>Microsoft SQL Server via the <code class="docutils literal notranslate"><span class="pre">SQLSRV</span></code> driver (version 2005 and above only)</p></li>
<li><p>Oracle Database via the <code class="docutils literal notranslate"><span class="pre">OCI8</span></code> driver (version 12.1 and above only)</p></li>
</ul>
</div></blockquote>
<p>Not all of the drivers have been converted/rewritten for CodeIgniter4.
The list below shows the outstanding ones.</p>
<blockquote>
<div><ul class="simple">
<li><p>MySQL (5.1+) via the <em>pdo</em> driver</p></li>
<li><p>Oracle via the <em>pdo</em> drivers</p></li>
<li><p>PostgreSQL via the <em>pdo</em> driver</p></li>
<li><p>MSSQL via the <em>pdo</em> driver</p></li>
<li><p>SQLite via the <em>sqlite</em> (version 2) and <em>pdo</em> drivers</p></li>
<li><p>CUBRID via the <em>cubrid</em> and <em>pdo</em> drivers</p></li>
<li><p>Interbase/Firebird via the <em>ibase</em> and <em>pdo</em> drivers</p></li>
<li><p>ODBC via the <em>odbc</em> and <em>pdo</em> drivers (you should know that ODBC is actually an abstraction layer)</p></li>
</ul>
</div></blockquote>
</section>
</section>
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