[drupal-devel] PHP 101: isset() does not check for zero length(empty) strings

[Steve Dondley]

I've reopened a bug report caused by this problem: http://drupal.org/node/20795

On 10/14/05, Steve Dondley <sdondley at gmail.com> wrote:
> I was thinking, this problem also stems from the fact that sometimes
> fields have a NULL value in the database and sometimes are stored as
> empty strings.  We will probably want to settle on a way of storing
> string in the database, too.
>
> On 10/13/05, Nedjo Rogers <nedjo at gworks.ca> wrote:
> > Awhile back I posted a similar question, see below.  We have a need for some
> > standard guidelines on when to use which test for empty, null, or set
> > variables, arrays, and object properties.
> > _______
> >
> > I find I'm sometimes not sure which types of test I should apply to test if
> > a variable (or array key) is null or empty.
> >
> > Looking at the code, I see various usages:
> >
> > if (is_null($variable))
> > if (empty($variable))
> > if ($variable == NULL)
> > if ($variable === NULL)
> > if ($objectname->propertyname)
> > if (array_key_exists($key, $arrayname))
> > if ($arrayname['key'])
> > etc.
> >
> > Can anyone point to or suggest a limited set of tests that we should use,
> > and guidelines for when each should be applied?  This would be a useful
> > addition to the coding standards, http://drupal.org/node/318.  Thanks!
> >
> >
>
>
> --
> Dondley Communications
> http://www.dondleycommunications.com
>
> Communicate or Die: American Labor Unions and the Internet
> http://www.communicateordie.com
>


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Dondley Communications
http://www.dondleycommunications.com

Communicate or Die: American Labor Unions and the Internet
http://www.communicateordie.com