> Thanks for the additional code, now I see what you are after. Sorry, I don't
> know the answer, other than using curly braces will fix the problem for
> empty(). Also, a User Contributed Note at
> http://www.php.net/manual/en/functions.php#functions.user-defined has this
> to say:
>
> <quote>
> there are tons of good uses for this sort of functionality. But it should be
> noted that this will not work with
> include()
> include_once()
> require()
> require_once()
>
> it's safe to assume that this is for safty.
> </quote>
These funtions are directives rather than normal php functions as the manual says.
I'm just guessing, maybe empty(), isset() and other variable-testing functions are
also directives with a function-syntax wrapper and this is the reason why PHP doesn't
find them as functions (not in the target-list :).
>
> Kirk
>
> > -----Original Message-----
> > From: Philip Olson [mailto:[EMAIL PROTECTED]]
> > Sent: Monday, May 07, 2001 11:45 AM
> > To: [EMAIL PROTECTED]
> > Subject: RE: [PHP] variable functions: empty/isset/unset invalid?
> >
> >
> >
> > I wish it were that easy. Also, I'm looking for words on WHY this
> > behavior exists.
> >
> > http://www.php.net/manual/en/functions.variable-functions.php
> >
> > <?php
> >
> > // works
> > if (empty($var)) print '$var is empty<br>';
> >
> > // works
> > $foo = 'is_string';
> > $var = 'abcdef';
> > if ($foo($var)) print '$var is a string<br>';
> >
> > // works
> > $foo = 'strlen';
> > $var = 'abcdef';
> > if ($foo($var) > 5) print '$var is over 5 chars<br>';
> >
> > // doesn't work : Fatal Error : Call to undefined function: empty()
> > // same with isset() and unset()
> > $foo = 'empty';
> > if ($foo($var)) print '$var is empty';
> >
> > ?>
> >
> > In otherwords, only these few functions aren't working as "variable
> > functions" but result in a "Fatal Error" instead. Why?
> >
> >
> > Regards,
> > Philip
> >
> > On Mon, 7 May 2001, Johnson, Kirk wrote:
> >
> > > Change the parens around $var to curly braces:
> > >
> > > if ($foo{$var}) print 'worked.';
> > >
> > > Kirk
>
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