Hi Andrea,
On Tue, Jul 15, 2014 at 11:10 AM, Yasuo Ohgaki <yohg...@ohgaki.net> wrote:
> On Tue, Jul 15, 2014 at 9:14 AM, Andrea Faulds <a...@ajf.me> wrote:
>
>> PHP currently lacks a way to do integer division. You can floor or int
>> cast a floating-point division, but beyond 53-bits that produces the wrong
>> result:
>>
>> $ sapi/cli/php -r 'var_dump((int)(PHP_INT_MAX / 3));'
>> int(3074457345618258432)
>>
>> Furthermore, using a floating-point division isn’t really a proper way to
>> do it; it’s a workaround for a lack of language support for a quite basic
>> operation. This RFC proposes a function for integer division, intdiv(). It
>> would work properly with 64-bit values:
>>
>> $ sapi/cli/php -r 'var_dump(intdiv(PHP_INT_MAX, 3));'
>> int(3074457345618258602)
>>
>
> We have GMP object from 5.6 and we can do
>
> [yohgaki@dev php-5.6]$ ./php-bin -r '$i = gmp_init('21342'); $a = $i / 3;
> var_dump($a);'
> object(GMP)#2 (1) {
> ["num"]=>
> string(4) "7114"
> }
> [yohgaki@dev php-5.6]$ ./php-bin -r '$i = gmp_init('21342'); $a = $i *
> 99999999; var_dump($a);'
> object(GMP)#2 (1) {
> ["num"]=>
> string(13) "2134199978658"
> }
>
> IMHO, GMP is the choice when precise computation is needed as it could be
> any number.
> Native integer type is much faster for sure. Question is do we really need
> it?
>
If we are going to have integer arithmetics, it may be better to have full
set of operators/functions
https://bugs.php.net/bug.php?id=30701
Regards,
--
Yasuo Ohgaki
yohg...@ohgaki.net
