undefined variable

[Tim Streater <tim@xxxxxxxxxxxxxxxx>]

I'm doing something like this:

  $PTR_fcc = isset($_POST['PTR_fcc'])==true ? $_POST['PTR_fcc'] : 0;

and possibly (maybe not, depends on some logic):

  $PTR_fcc = ($fcco==0 || $mboxid==$inboxid || $mboxid==$outboxid || $mboxid==$junkboxid || $mboxid==$trashboxid) ? 0 : $mboxid;

and then later I do:

  $str = "fcc: " . $PTR_fcc;

Now, upon examination it appears that I have an instance where $str ends up as:

  fcc: undefined


My question is, under what conditions can a variable be set by the PHP system to the string "undefined"? Would this require that my ajax call in the browser would have to have had something explicit like:

  ... &PTR_fcc=undefined ...

--
Cheers  --  Tim

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