If you mean things like if, else, etc... Then a quick Google search will provide you with a ton of basic tutorials. The syntax is quite easy to follow. Same solution if you're talking about conditional loops.
I tried again, I restarted and tried again, for some reason my browser is not showing your site, though it loaded, and I can see the source code.
Chemo is on the right track, I think. I looked at this thread a while ago and didn't know what 'conditional functions' were, so I steered clear But yeah, Chemo makes a good point and he jolted my memory: it may also be in reference to using call_user_func ( http://ca3.php.net/manual/en/function.call-user-func.php ) whereby you can use a variable to define the name of the function to call.
There's always the php website, www*php.net if(statement) { $result = Function_A(); } else { $result = Function_A(); } or function testFunction($var) { if($var==statement) { //do somthing //return something } else { //do somthing else //return something else } //or return something here }