Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:3966
Return-Path: <torben@php.net>
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Delivered-To: mailing list internals@lists.php.net
Received: (qmail 20333 invoked from network); 14 Aug 2003 21:11:39 -0000
Received: from unknown (HELO pd3mo2so.prod.shaw.ca) (24.71.223.10)
  by pb1.pair.com with SMTP; 14 Aug 2003 21:11:39 -0000
Received: from pd5mr3so.prod.shaw.ca
 (pd5mr3so-qfe3.prod.shaw.ca [10.0.141.144]) by l-daemon
 (iPlanet Messaging Server 5.2 HotFix 1.16 (built May 14 2003))
 with ESMTP id <0HJM00EJBNY1W5@l-daemon> for internals@lists.php.net; Thu,
 14 Aug 2003 15:06:01 -0600 (MDT)
Received: from pn2ml7so.prod.shaw.ca
 (pn2ml7so-qfe0.prod.shaw.ca [10.0.121.151]) by l-daemon
 (iPlanet Messaging Server 5.2 HotFix 1.16 (built May 14 2003))
 with ESMTP id <0HJM002PUNY1WY@l-daemon> for internals@lists.php.net; Thu,
 14 Aug 2003 15:06:01 -0600 (MDT)
Received: from h24-84-221-8.vc.shawcable.net
 (h24-84-221-8.vc.shawcable.net [24.84.221.8])
 by l-daemon (iPlanet Messaging Server 5.2 HotFix 1.16 (built May 14 2003))
 with ESMTP id <0HJM00N6RNY12S@l-daemon> for internals@lists.php.net; Thu,
 14 Aug 2003 15:06:01 -0600 (MDT)
Date: Thu, 14 Aug 2003 14:05:29 -0700
In-reply-to: <20030814210117.GA26541@prp0.prp.physik.tu-darmstadt.de>
To: Stefan Walk <swalk@prp.physik.tu-darmstadt.de>
Cc: walt boring <waboring@3gstech.com>, internals@lists.php.net
Message-ID: <1060895128.3102.103.camel@ali>
Organization:
MIME-version: 1.0
X-Mailer: Ximian Evolution 1.2.4
Content-type: text/plain
Content-transfer-encoding: 7BIT
References: <1060813541.901.336.camel@ali>
 <200308141145.38495.ilia@prohost.org> <3F3BD1D7.70209@3gstech.com>
 <20030814182806.GA25430@prp0.prp.physik.tu-darmstadt.de>
 <3F3BDC4A.20603@3gstech.com>
 <20030814210117.GA26541@prp0.prp.physik.tu-darmstadt.de>
Subject: Re: [PHP-DEV] variable_exists() patch
From: torben@php.net (Lars Torben Wilson)

On Thu, 2003-08-14 at 14:01, Stefan Walk wrote:
> On Thu, Aug 14, 2003 at 12:00:26PM -0700, walt boring wrote:
> > It can happen quite easily.  I always develop with full warnings/errors on.
> 
> So do I.
> 
> > So if for example a var isn't set for whatever reason,  then trying to 
> > access the
> > variable will throw a php Notice.  variable_exists() would prevent that, 
> > as does isset().
> 
> Correct, isset works.
> 
> > isset() would work for my example below, but it still is a 'broken' 
> > function in my opinion.
> > 
> > if ($var) {  // <-- you'll get a php notice on this line
> >  switch ($var) {
> >    ...
> >  }
> > 
> > }
> > 
> > versus doing
> > 
> > if (variable_exists($var))  {  //no php notices here
> >  switch($var) {
> >   ...
> >  }
> > }
> 
> As you already stated, isset works also. I asked for an occasion where
> your variable_exists would be useful because isset does not work.
> 
> DB arguments don't count, if a value is null in a database it is
> considered - you guessed it - not set.
> 
> I simply don't see a need for this.

I have posted several examples, complete with code and output.


-- 
 Torben Wilson <torben@php.net>                        +1.604.709.0506
 http://www.thebuttlesschaps.com          http://www.inflatableeye.com
 http://www.hybrid17.com                  http://www.themainonmain.com
 -----==== Boycott Starbucks!  http://www.haidabuckscafe.com ====-----