I am confused. I want to run some simple php commands inside my form. Should be easy right?

I made the form & exported for manual setup.

I modified the .html form file to include my php & tested it by loading it directly - all is good.
I created a new file (also .php due to a couple of items) to put the iframe call remembering to change the form file to .php rather than .html. - No go!
Figured I made a mistake so looked around for a while - cannot find anything. So go back to basics. Renamed my .php form file to a .html and called it from the file I created to hold the iframe call. The form renders (admittedly ugly due to my php no longer operational). I now know all is good. Put the call & the form back to .php and again no form renders.

Any one got any ideas?

Are you using the iframe snippet as supplied by the form builder? If you are did you change the myformname.html to .php

yep - changed it.

D'ohhh - my bad I think. This is the code that is due to be in the calling file. The afterbooking.php shown in BOLD seems to need to be afterbooking\afterbooking.php

<script type="text/javascript">document.write(unescape("%3Ciframe id=\"fb_iframe\" src=\"afterbooking.php" + window.location.search + "\" width=\"100%\" height=\"5164\"allowtransparency=\"true\" scrolling=\"no\" frameborder=\"0\"%3E&lt;a href=\"afterbooking.php\" title=\"afterbooking\"&gt;Check out my CoffeeCup Form&lt;/a&gt;%3C/iframe%3E"));</script>
<noscript>
<iframe width="100%" height="5164" style="border:none; background:transparent; overflow:hidden;"
id="fb_iframe" src="afterbooking/afterbooking.html">
&lt;a href="afterbooking.php" title="afterbooking"&gt;Check out my CoffeeCup
Form&lt;/a&gt;
</iframe>
</noscript>

When using customizations in the form builder it's usually necessary to remove the script wrapping the iframe code.

Thanks Eric. I have commented the script out and all works well. What role does that portion generally perform?

The noscript tag serves up different content for users that have javascript disabled.