Re: [PHP] Recursion... Sort of...

On Thu, May 8, 2008 at 3:48 PM, Matt Neimeyer <[email protected]> wrote:

> Is there a way to tell if a function has been called that has resulted
> in a call to the same function?
>
> We have an in-house CRM app that has a function that draws a tabbed
> panel on a screen... BUT if there are sub-sub-tabbed panels we want to
> invert the tab colors and panel colors...
>
> So...
>
> DrawSubTab($Set) - Black on White
>   Content
>   DrawSubTab($Set) - White on Black
>      Content
>      DrawSubTab($Set) - Black on White
>         Content
>      DrawSubTab($Set) - Black on White
>         Content
>         Etc...
>
> I suppose I could rewrite EVERY call to the function with a recursion
> count like DrawSubTab($Set,$DepthCount+1) but that would be a MASSIVE
> commit... whereas if the function can determine itself... All that
> said I can't think of a good way to do it without a bastardized global
> variable that track "how deep" we are and there is something that
> bothers me about that approach... Unless that really is the easiest
> way.


you dont need a global, you can have a variable that persists throughout the
request local only to the function itself using the static keyword.

function doStuff() {
  static $callCount;

  if(!isset($callCount))
   $callCount = 1;
  else
    $callCount++;

  /// do stuff w/ $callCount to potentially handle sub-tabs and stuff

  $callCount--;
}

-nathan