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Date: Mon, 30 Dec 2013 13:59:52 +0900
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To: "internals@lists.php.net" <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=047d7b3a84c2d3806304eeb952c2
Subject: Re: GMP and empty()
From: yohgaki@ohgaki.net (Yasuo Ohgaki)

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Hi all,

I thought GMP object does not work with math functions, but some of them
work.
Apparently, I was only testing with function that does not work with GMP.
Some math function
works. e.g. pow() with small value. min()/max() seems ok.

Not only empty(), but there are number of wired behavior with GMP and
functions.

I haven't tried them all, but we need to work more for these.
It seems time to write more tests and fix issues.

=3D=3D=3D pow() =3D=3D=3D
[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("2"); var_dump(pow($v, 10));'
int(1024)

This works fine.

[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("223423"); var_dump(pow($v, 234242));'
float(INF)

This returns float(INF). It may be acceptable. Returning GMP object with
correct value is better.

[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("223423423423423423423422342342342342.234234234");
var_dump(pow($v, 234242));'
int(0)

but this returns int(0).

=3D=3D=3D round()/floor()/ceil()=3D=3D=3D

[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("25.234242342"); var_dump(round($v));'
float(0)

It should be 25. floor()/ceil() is the same.

=3D=3D=3Dabs()=3D=3D=3D

[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("25.234242342"); var_dump(abs($v));'
int(0)

It returns int(0).


=3D=3D=3Dacos()=3D=3D=3D
[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("25.234242342"); var_dump(acos($v), acos(25.234242342));'
float(1.5707963267949)
float(NAN)

Something wrong.

=3D=3D=3Dcos()=3D=3D=3D
[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("25.234242342"); var_dump(cos($v), cos(25.234242342));'
float(1)
float(0.99485318302495)

Almost correct, but it's not.

If GMP integer is passed, it raises E_WARNING.

[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("2"); var_dump(cos($v), cos(2));'
Warning: cos() expects parameter 1 to be double, object given in Command
line code on line 1
NULL
float(-0.41614683654714)

=3D=3D=3Dlog=3D=3D=3D
[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("2"); var_dump(log($v), log(2));'
Warning: log() expects parameter 1 to be double, object given in Command
line code on line 1
NULL
float(0.69314718055995)

[yohgaki@dev php-src]$ ./php-bin -d error_reporting=3D-1 -r '$v =3D
gmp_init("2.2"); var_dump(log($v), log(2.2));'
float(-INF)
float(0.78845736036427)


Something wrong.
=E2=80=8B

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