[PHP] Include question

[John Holmes]

Hi. When I've got code like the following:
 
if($this) { include("this.html"); }
elseif($that) { include("that.html"); }
 
When are the includes() evaluated? Does the Zend engine do the includes
first, pull in all of the code, then process it and produce output. Or
does the engine start processing the code and only load the includes
when it gets to them?
 
Thanks for any explanations.
 
---John Holmes.