se separate files for each class, unless the classes are <em>closely related</em>.
An example of a CodeIgniter file that contains multiple classes is the
Xmlrpc library file.</p>
</div>
<div class="section" id="whitespace">
<h2><a class="toc-backref" href="#id18">Whitespace</a><a class="headerlink" href="#whitespace" title="Permalink to this headline">¶</a></h2>
<p>Use tabs for whitespace in your code, not spaces. This may seem like a
small thing, but using tabs instead of whitespace allows the developer
l