what exactly is action ?

i usually use a action setup like follows

?action=update

switch ($_GET['action']) {
   case 'update':
      //do stuff here
   break;
   case 'insert':
      //do stuff here
   break;

}

very clean

> Here's the problem I have:
> I have $action which can be anyone of a1, a2, a3, a4.
> I tried
>
> if ($action!='a1' || $action!='a3') //tried == also
> {
> //do stuff
> }
> else
> {
> //do other stuff
> }
>
> Problem is that if() only seems to take one option so my construct
> above doesn't work.
> What function can I use to do something like:
> if ($action is among the items of 'a2,a4') kind of construct?
> I tried strpos('a1a2a3',$action) but with the same results.
> TIA
>
> --
> Regards, Andu Novac
>
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