 <p>Many folks, including Zend, tell programmers to use camel case, but personally I used underscores as word separators for variable names, array keys, class names and function names. Also, all lowercase, except for class names, where I <em>will</em> use capitals.</p> <p>For example:</p> <pre><code>class News { private $title; private $summary; private $content; function get_title() { return $this-&gt;title; } } $news = new News; </code></pre>