Re: INF behavior

Agree with Derick, strictly speaking, in maths science, INF != INF. But I dont care if PHP tells me than yes, because PHP is not designed to solve high level maths problems :) Cheer, Julien.Pauli On Fri, May 27, 2011 at 4:48 PM, Derick Rethans <derick@php.net> wrote: > On Thu, 26 May 2011, Scott MacVicar wrote: > >> On 26 May 2011, at 20:03, Philip Olson <philip@roshambo.org> wrote: >> >> > Hello geeks, >> > >> > A geek is needed to clarify PHP bug #45712. This is an edge case but the test >> > (bug45712.phpt) contains code similar to the following: >> > >> > <?php >> > $inf = pow(0, -2); >> > >> > var_dump($inf);          // float(INF) >> > var_dump($inf ==  $inf); // bool(false) >> > var_dump($inf === $inf); // bool(true) >> > ?> >> > >> > That's how it's behaved since ~forever (AFAICT) and remains in 5.3.7-dev, >> > but PHP 5.4.0-dev changes behavior so both now return true. >> > >> > Is this is how we want it? And how should this be documented/explained? >> >> I think I changes this :-) >> >> It didn't make sense that == and === produce different results.. >> >> Though if someone has a better understanding of maths then we can fix it.. > > I think it does make sense. == is the equal operator, and INF is not > equal to INF (just like SQL NULL is not equal to NULL). However, they > are identical (like you can test in SQL with NULL IS NULL). > > cheers, > Derick > > -- > http://derickrethans.nl | > http://xdebug.org > Like Xdebug? Consider a donation: http://xdebug.org/donate.php > twitter: @derickr and @xdebug > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php > >