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To: Hans Lellelid <hans@velum.net>
Cc: Dan Ostrowski <dan@ostrowski.cc>, internals@lists.php.net
In-Reply-To: <411AE970.2080908@velum.net>
References: <41196A1D.6060808@velum.net>
	 <200408112219.55268.dan@ostrowski.cc> <411AE454.4060808@akbkhome.com>
	 <411AE970.2080908@velum.net>
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Date: Thu, 12 Aug 2004 04:58:54 -0500
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Subject: Re: [PHP-DEV] is_a() vs. instanceof
From: ajb732@comcast.net (Al Baker)

I agree, that's the exact behavior I would like as well and what most
people would expect.

Al

On Wed, 2004-08-11 at 23:52 -0400, Hans Lellelid wrote:
> Alan Knowles wrote:
> 
> > I think he's referening to something like this (which is common in pear):
> > 
> > $x = $someobj->somemethod();
> > if ($x instanceOf PEAR_Error) {
> >   .......
> > }
> > 
> > while that code is redundant in the case of exceptions, it is still a 
> > valid situation.. that $x may be a valid return, and PEAR_Error was 
> > never loaded..
> 
> 
> Yup, that's exactly what I'm talking about.
> 
> I want to be able to do this:
> 
> if ($db instanceof DBPostgres) {
>    /// do something funky specific to Postgres
> }
> 
> If My DB adapter is DBMySQL, I don't want to load the DBPostgres adapter 
> just so I can test whether my object is of that type ...
> 
> and checking first whether class_exists('DBPostgres') just seems kinda 
> kludgy & straying from the "problem domain" ... especially since $db 
> instanceof DBPostgres would *always* be false if DBPostgres isn't loaded.
> 
> Hans
>