[sr-dev] trouble with testing $var
Juha Heinanen
jh at tutpro.com
Mon Nov 9 21:58:25 CET 2009
Andrei Pelinescu-Onciul writes:
> > $var(tmp) = $(ru{uri.param,alias});
> > xlog("L_INFO", "Alias param is <$var(tmp)>\n");
> > if ($var(tmp)) {
> > xlog("L_INFO", "Alias param is <$var(tmp)>\n");
> > $du = $var(tmp);
> ^^^^^^^^
> shouldn't it be $du = "sip:" + $var(tmp) ?
andrei,
yes, it should have been like that. now handle_alias() takes care of
it.
> > why does the test
> >
> > if ($var(tmp)) {
> >
> > fail to figure out that $var(tmp) has value?
>
> You should use if ($var(tmp)!="").
> if ($var(tmp)) works only for integers. If $var(tmp) is not integer and
> not a string of the form "1234", it will evaluate to 0 in an integer
> context. The if() it's an integer context (no boolean context in sr).
thanks for the explanation. i have to say though that as a normal
programmer, i'm not used to such behavior.
in order to avoid programming mistakes like that, could it be possible
to produce a error message if such a test is attempted, i.e., test on
string valued pvar?
-- juha
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