[Lvlug] PHP Test foir Variable

[Caleb Shay]

Oh, in this case you could also use:

if (array_key_exists('bar',$_REQUEST)) {
	// whatever action
}

The difference is that if $_REQUEST['bar'] == null (as in, it has been
set, but the value is null) then array_key_exists will still return
true, while isset will return false.

PHP easily has the best online documentation of any language I've ever
had to use.  http://www.php.net/<whatever you are looking for> will
either give you the documentation on the function or do a search for
whatever you are looking for in the docs.

Cheers,

Caleb

On Thu, 2005-12-22 at 09:54 -0500, Caleb Shay wrote:
> if (isset($_REQUEST['bar'])) {
> 	// whatever action
> }
> 
> Cheers,
> 
> Caleb
> 
> On Thu, 2005-12-22 at 06:33 -0500, Paul Ryan wrote:
> > Holiday Greetings, All.
> > 
> > I'm doing a happy dance having finally gotten Apache 2.2, MySQL 4.1.14,  PHP
> > 4.4.1 and SSL running under Slack 10.2.  When one stays on older versions too
> > long, the move up to "current" can be painful!
> > 
> > My question today concerns PHP.  Is there a way to test for the existence of
> > an item in the query string without actually equating the item.  For
> > instance:
> >   $foo = $_POST['bar'];
> > or
> >   $foo = $_REQUEST['bar]';
> > will both generate errors if bar was not defined in the calling FORM document.
> >  I would think there would be something like "if_exists" or "if_defined" or
> > "exists" but I couldn't find it in my manual search.  Oh, that's another
> > thing, as the version numbers grow, so does the size of the manuals!
> > 
> > :)
> > Paul
> > 
> > 
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