On Thu, May 8, 2008 at 6:23 PM, Jim Lucas <lists@xxxxxxxxx> wrote:
> Nathan Nobbe wrote:
>
>> On Thu, May 8, 2008 at 3:48 PM, Matt Neimeyer <matt@xxxxxxxxxxxx> 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
>>
>>
> Look at the way he wants it to work. Your way would change alternate the
> color each time the function is called. I think the best/easiest way to
> keep track of depth will be by passing a variable in the function call
> itself.
actually, i didnt supply the part where he does what he wants with the
depth. i merely provided a way to track it without using a global
variable. he could easily do something specific depending upon the depth
with what ive shown.
<?php
function doStuff() {
static $callCount;
if(!isset($callCount))
$callCount = 1;
else
$callCount++;
/// do stuff w/ $callCount to potentially handle sub-tabs and stuff
if($callCount == 2) {
echo 'white on black';
} else {
echo 'black on white';
}
echo PHP_EOL;
}
doStuff();
doStuff();
doStuff();
doStuff();
doStuff();
?>
nathan-nobbes-macbook-pro:~ nnobbe$ php testDepth.php
black on white
white on black
black on white
black on white
black on white
o ya and removed the part where the variable is decremented from the
original ;) (good call there jim) i was thinking the function was going to
be called recursively at first which is why i had it in there and it would
make sense in that case; however since it isnt going to be called
recursively it doesnt.
-nathan
