If a function is not called in PHP does the code still run within the function?
<p>I was wondering, I have a few functions in PHP that're not called every time but still are included in my files on each load. Does it still run the code even if your not calling the function at that time? The reason I'm asking, the codes in my function are expensive to run CPU wise and I don't call them every time and want to make sure if there not called they do not run the code within the function.</p>

<p>Thank you</p>
