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Date: Mon, 16 Feb 2004 16:07:53 -0500
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To: zeev@zend.com
Cc: Hans Lellelid <hans@velum.net>, internals@lists.php.net
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Subject: Re: [PHP-DEV] extending interfaces - fringe behavior
From: hans@appliedsec.com (Hans Lellelid)

Hi -

Zeev Suraski wrote:
> At 07:55 16/02/2004, Hans Lellelid wrote:
> 
>> I have a need in a current application to extend interfaces and 
>> possibly re-define (change signature) some of the inherited methods in 
>> the child interface.
> ...
> 
> 
> You're not supposed to change the signature when you're 
> extending/implementing interfaces.  I'll try to see if it's feasible to 
> improve the checks so that they compare signatures in a smarter way 
> (i.e., func($arg1, $arg2=null) is  compatible with func($arg1), and 
> currently it's not detected that way).
> 

Yeah, I realize that wanting to change signatures of parent interfaces 
is a little weird; I'd submit that it does allow for some nice design 
possibilities -- but perhaps modifying an interface is at odds with the 
idea of an interface.  I think I probably want to just copy & paste the 
methods that are the same rather than extend.

Making it possible to re-define methods w/ additional null params would 
be nice if that makes sense.

Thanks!
Hans