Is there much overhead to including long function collection in PHP?
<p>Suppose I have a very long file, utilities.php, which contains most if not all functions used by the web application. Every single page loaded will include() this file, but utilize maybe just a handful of the functions in it.</p>

<p>Are there any significant downsides to doing things this way, performance wise? I could split the file into several based on the type of functionality provided, but strictly from performance perspective, is it bad to include everything into every page, but run only what is needed?</p>
