Re: Re: power operator (again)

On 19 Dec 2013 21:58, "Rasmus Lerdorf" <rasmus@lerdorf.com> wrote: > > On 12/19/2013 04:50 PM, Kris Craig wrote: > > I believe that, especially for a KISS language like PHP, our top priority > > with math operators should be to match arithmetic laws as closely and as > > intuitively as possible. The average PHP developer is going to do -3 ** 2 > > and expect a result of 9, not -9, and rightly so I think. > > No, the average PHP developer is going to do $var ** 2 and it will > behave exactly as they expect with negative values. Yes, in the very I didn't quite understand if you're making the case for assuming a type casting of $var and keep with the expected math or if operator precedence would mean the result could be negative in some cases. Example: $str = '-3'; $res = 0 - $str ** 2; PEMDAS would mean this results in $res having a value of 9 whatever the case ($str positive or negative)! Would this be different in regards to operator precedence? > rare case that someone for some reason hardcodes a negative literal > there, they are going to have to learn about operator precedence because > we really can't have 0 - 3**2 be different from - 3**2. > > -Rasmus > > > -- > PHP Internals - PHP Runtime Development Mailing List > To unsubscribe, visit: http://www.php.net/unsub.php >