$this->{$this->varname}() syntax
<p><a href="http://www.php.net/manual/en/functions.variable-functions.php#24931" rel="nofollow">http://www.php.net/manual/en/functions.variable-functions.php#24931</a></p>

<p>That function does something like <code>$this-&gt;{$this-&gt;varname}()</code>. I tried it out and confirmed that that's valid syntax but it leaves me wondering...  where does php.net discuss the use of curly brackets in variable names like that?</p>
