 a suitable fallback, or be an optional feature that
dies quietly without affecting a user&#8217;s application.</p>
<p>Additionally, do not use PHP functions that require non-default libraries
to be installed unless your code contains an alternative method when the
function is not available.</p>
</div>
<div class="section" id="one-file-per-class">
<h2><a class="toc-backref" href="#id17">One File per Class</a><a class="headerlink" href="#one-file-per-class" title="Permalink to this headline">¶</a></h2>
<p>U