a - b = (+a) + (-b) = (-b) + (+a)
The argument is about the ternary operator though:
#include<stdio.h>
main()
{
int a = 1;
printf("%s", (a == 1) ? "one" : (a == 2) ? "two" : "three");
}
in C outputs:
>> one
So, why is PHP different?
Tim-Hinnerk Heuer
Twitter: @geekdenz
Blog: http://www.thheuer.com
On 18 October 2013 13:59, Tamara Temple <tamouse.lists@xxxxxxxxx> wrote:
> Ternary operator works the same in every language I've encountered… you
> can expand every such statement to an if-then-else if it makes you feel
> better. Not every operator in math is transitive, either. a - b is not the
> same as b - a, for example.
>
>
> On Oct 17, 2013, at 7:51 PM, Tim-Hinnerk Heuer <th.heuer@xxxxxxxxx> wrote:
>
> > No, but when you add stuff it gets the same result from left to right as
> > from right to left.
> > So, the ternary operator is more related to logic, even though logic
> > belongs to math.
> >
> > Tim-Hinnerk Heuer
> >
> > Twitter: @geekdenz
> > Blog: http://www.thheuer.com
> >
> >
> > On 18 October 2013 13:49, Daniel <danielx386@xxxxxxxxx> wrote:
> >
> >> On Fri, Oct 18, 2013 at 11:46 AM, Tim-Hinnerk Heuer <th.heuer@xxxxxxxxx
> >
> >> wrote:
> >>> Hi,
> >>>
> >>> I've been a PHP programmer for several years now and have a bit of a
> >>> love-hate relationship with it. It's great for doing something quickly,
> >>> especially web stuff, but recently I have heard people moaning about
> PHP
> >> a
> >>> lot and did some research and found this:
> >>>
> >>> http://webonastick.com/php.html
> >>>
> >>> One thing I had to get my head around is this:
> >>> The ternary operator
> >>> <?php
> >>> $foo = 1;
> >>> print(($foo == 1) ? "uno" : ($foo === 2) ? "dos" : "tres");
> >>> print("\n");
> >>>
> >>> outputs
> >>>>> dos
> >>>
> >>> because the operator is left-to-right associative instead of
> >> right-to-left
> >>> as in other languages. I was thinking there must be a reason for this.
> >>> Speed? Is it faster to evaluate/implement all operators as
> left-to-right?
> >>>
> >>> I noticed that the above could easily be fixed by saying:
> >>>
> >>> <?php
> >>> $foo = 1;
> >>> print(($foo == 1) ? "uno" : (($foo === 2) ? "dos" : "tres"));
> >>> print("\n");
> >>>
> >>> outputs
> >>>>> uno
> >>>
> >>> Was this a deliberate design decision or is it a flaky implementation
> of
> >>> the ternary operator?
> >>>
> >>> Tim-Hinnerk Heuer
> >>>
> >>> Twitter: @geekdenz
> >>> Blog: http://www.thheuer.com
> >>
> >>
> >> Maybe it just me but I look at it the same as math, you don't add
> >> something up from right to left do you?
> >>
>
>
