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<div class="section" id="introduction">
<h1>Introduction<a class="headerlink" href="#introduction" title="Permalink to this headline">¶</a></h1>
<p>This is the documentation for Twig, the flexible, fast, and secure template
engine for PHP.</p>
<p>If you have any exposure to other text-based template languages, such as
Smarty, Django, or Jinja, you should feel right at home with Twig. It’s both
designer and developer friendly by sticking to PHP’s principles and adding
functionality useful for templating environments.</p>
<p>The key-features are…</p>
<ul class="simple">
<li><em>Fast</em>: Twig compiles templates down to plain optimized PHP code. The
overhead compared to regular PHP code was reduced to the very minimum.</li>
<li><em>Secure</em>: Twig has a sandbox mode to evaluate untrusted template code. This
allows Twig to be used as a template language for applications where users
may modify the template design.</li>
<li><em>Flexible</em>: Twig is powered by a flexible lexer and parser. This allows the
developer to define their own custom tags and filters, and to create their own DSL.</li>
</ul>
<p>Twig is used by many Open-Source projects like Symfony, Drupal8, eZPublish,
phpBB, Piwik, OroCRM; and many frameworks have support for it as well like
Slim, Yii, Laravel, Codeigniter and Kohana — just to name a few.</p>
<div class="section" id="prerequisites">
<h2>Prerequisites<a class="headerlink" href="#prerequisites" title="Permalink to this headline">¶</a></h2>
<p>Twig needs at least <strong>PHP 7.0.0</strong> to run.</p>
</div>
<div class="section" id="installation">
<h2>Installation<a class="headerlink" href="#installation" title="Permalink to this headline">¶</a></h2>
<p>The recommended way to install Twig is via Composer:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>composer require <span class="s2">"twig/twig:^2.0"</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">To learn more about the other installation methods, read the
<a class="reference internal" href="installation.html"><span class="doc">installation</span></a> chapter; it also explains how to install
the Twig C extension.</p>
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<div class="section" id="basic-api-usage">
<h2>Basic API Usage<a class="headerlink" href="#basic-api-usage" title="Permalink to this headline">¶</a></h2>
<p>This section gives you a brief introduction to the PHP API for Twig.</p>
<div class="highlight-php"><div class="highlight"><pre><span></span><span class="x">require_once '/path/to/vendor/autoload.php';</span>
<span class="x">$loader = new Twig_Loader_Array(array(</span>
<span class="x"> 'index' => 'Hello {{ name }}!',</span>
<span class="x">));</span>
<span class="x">$twig = new Twig_Environment($loader);</span>
<span class="x">echo $twig->render('index', array('name' => 'Fabien'));</span>
</pre></div>
</div>
<p>Twig uses a loader (<code class="docutils literal"><span class="pre">Twig_Loader_Array</span></code>) to locate templates, and an
environment (<code class="docutils literal"><span class="pre">Twig_Environment</span></code>) to store the configuration.</p>
<p>The <code class="docutils literal"><span class="pre">render()</span></code> method loads the template passed as a first argument and
renders it with the variables passed as a second argument.</p>
<p>As templates are generally stored on the filesystem, Twig also comes with a
filesystem loader:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span>$loader = new Twig_Loader_Filesystem('/path/to/templates');
$twig = new Twig_Environment($loader, array(
'cache' => '/path/to/compilation_cache',
));
echo $twig->render('index.html', array('name' => 'Fabien'));
</pre></div>
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<li><a class="reference internal" href="#">Introduction</a><ul>
<li><a class="reference internal" href="#prerequisites">Prerequisites</a></li>
<li><a class="reference internal" href="#installation">Installation</a></li>
<li><a class="reference internal" href="#basic-api-usage">Basic API Usage</a></li>
</ul>
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title="previous chapter">Twig</a></p>
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title="next chapter">Installation</a></p>
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