<?php
$message = 'Hello World!';
echo $message;
---
> not a quote
- not a list item
[not a reference]: http://foo.com
<?php
$message = 'Hello World!';
echo $message;
> not a quote
- not a list item
[not a reference]: http://foo.com
<pre><code><?php
$message = 'Hello World!';
echo $message;</code></pre>
<hr />
<pre><code>> not a quote
- not a list item
[not a reference]: http://foo.com</code></pre>