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Subject: Re: static/object method
From: taco@procurios.nl (Taco van den Broek)

Hans Lellelid wrote:

> Hi all,
> 
> I have a pattern I'm trying to implement in PHP5 using a class that 
> could be called statically or non-statically.  Perhaps "pattern" gives 
> this too much legitimacy :)  I can't figure out how to do this & wanted 
> to ask if a) it's possible at all and b) if there's been any solution 
> discussed for such an approach.
> 
> Here's what I'm trying to do, but can't figure out a way in PHP5 (or a 
> non-hack way in PHP4):
> 
> - AuthorFinder is a class that can be used statically for default 
> behavior or instantiated if customized behavior is needed.
> 
> static, default behavior, probably accounts for 80% of uses:
> 
> $c = new Criteria(Author::NAME, "Leo");
> $a = AuthorFinder::find($c);

You pass your criteria to your search class as instantiated objects, why 
don't you pass your parameters/config flags as another type of object? 
Maybe like this:

$c = new Criteria(Author::NAME, "Leo");
$f = new ConfigFlag(AuthorFinder::LIMIT, '5');
$a = AuthorFinder::find($c, $f);

You could then check the $f object for any customizations, just like you 
check the $c object for where to search.

> 
> instantiated behavior for performing customizations:
> 
> $c = new Criteria(Author::NAME, "Leo");
> $af = new AuthorFinder();
> $af->setLimit(5);
> $a = $af->find($c);
> 
> Is there *any* way to accomplish that in PHP5?  I can't reference $this 
> -- even to check isset() (which would probably be misleading anyway) 
> from inside a method declared as static.  If I do not declare the method 
> static then calling it statically triggers E_STRICT error which I want 
> to avoid since I'm writing PHP5 code.   Perhaps I'm missing an obvious 
> solution, in which case I apologize & probably should have asked 
> php-general.
> 
> It would be *really* cool if PHP could support this type of pattern, as 
> there have been a few cases where I've wanted to apply this in PHP5.  
> Perhaps this has already been discussed & I just didn't notice.
> 
> Thanks,
> Hans