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To: Michael Wallner <mike@php.net>
Cc: internals@lists.php.net
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Date: Thu, 16 Jun 2005 07:36:19 +0800
Message-ID: <1118878580.16156.4.camel@alanportable2.hklc.com>
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Subject: Re: [PHP-DEV] while we're at it (PHP-5.1 & instanceof)
From: alan@akbkhome.com (Alan Knowles)

http://www.akbkhome.com/blog.php/View/75/removing+that+stupid+is_a
+warning..html

You're not the only one ;)

Regards
Alan
On Wed, 2005-06-15 at 23:15 +0200, Michael Wallner wrote:
> I already complained about that issue several times on IRC
> and now that it's time for PHP-5.1 to come, I'll just throw
> this question/rant in...
> 
> Using is_a() throws a notice (E_STRICT IIRC) in PHP5, which
> should be fine, because it was deprecated in favour of the
> instanceof operator.  But there's quite an ugly problem with
> the instnceof operator - it needs the class to be checked
> already loaded, while is_a() didn't -- *and* instanceof
> let the script _die_ if there's no such class.
> 
> To replace
> 	is_a($obj, 'ClassName')
> calls one would need to write
> 	class_exists('ClassName') && ($obj instanceof ClassName)
> 
> The point is, that I don't see the point why is_a() has been
> deprecated (and replaced) by an operator that doesn't provide
> the same functionality and can even be harmful (with fatal errors).
> 
> Regards,
> Mike
>