FAQ
Hi,

Can someone please point me to a Win32 build which has a working NaN? The last few releases on php.net all share the same problems, which are leading to real-world bugs in userland code:

var_dump(NAN); // float(0), should be float(NAN)
$realNaN = sqrt(-1);
var_dump($realNaN); // float(NAN)
var_dump($realNaN == $realNaN); // true, should be false, NaN should never match NaN

Regards,
Stan Vassilev

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  • Pierre Joye at May 24, 2009 at 8:41 am
    hi,

    Try VC9 snapshots from http://windows.php.net please.

    Cheers,
    --
    Pierre

    2009/5/24 Stan Vassilev <sv_forums@fmethod.com>:
    Hi,

    Can someone please point me to a Win32 build which has a working NaN? The last few releases on php.net all share the same problems, which are leading to real-world bugs in userland code:

    var_dump(NAN); // float(0), should be float(NAN)
    $realNaN = sqrt(-1);
    var_dump($realNaN); // float(NAN)
    var_dump($realNaN == $realNaN); // true, should be false, NaN should never match NaN

    Regards,
    Stan Vassilev


    --
    Pierre

    http://blog.thepimp.net | http://www.libgd.org
  • Stan Vassilev at May 24, 2009 at 9:19 am

    hi,

    Try VC9 snapshots from http://windows.php.net please.

    Cheers,
    --
    Pierre
    Hi,

    Thanks for your pointed, though I couldn't find VC9 builds for any stable
    release (5.2.x) of PHP?

    I'll check with 5.3.x a bit later, but what is the recommendation for those
    of us who have to deploy PHP on Windows today? Go with the RC of 5.3?

    Regards,
    Stan Vassilev
  • Carsten Wiedmann at May 24, 2009 at 9:53 am
    Hello,
    var_dump(NAN); // float(0), should be float(NAN)
    $realNaN = sqrt(-1);
    var_dump($realNaN); // float(NAN)
    var_dump($realNaN == $realNaN); // true, should be false, NaN should never match NaN
    That's interesting. With my own 5.2.9 build (vc6), I have "false" in the
    last test (comparing the variable):
    # php -n -r "var_dump(NAN);$n=sqrt(-1);var_dump($n);var_dump($n==$n);"
    float(0)
    float(NAN)
    bool(false)
    With the official 5.2.9 or 5.2.10-dev builds it's "true" on the same machine
    (xp sp3).


    BTW: is_nan($realNaN) is working with the official build.

    Regards,
    Carsten
  • Lukas Kahwe Smith at Jun 18, 2009 at 2:15 pm

    On 24.05.2009, at 11:53, Carsten Wiedmann wrote:

    Hello,
    var_dump(NAN); // float(0), should be float(NAN)
    $realNaN = sqrt(-1);
    var_dump($realNaN); // float(NAN)
    var_dump($realNaN == $realNaN); // true, should be false, NaN
    should never match NaN
    That's interesting. With my own 5.2.9 build (vc6), I have "false" in
    the
    last test (comparing the variable):
    # php -n -r "var_dump(NAN);$n=sqrt(-1);var_dump($n);var_dump($n== $n);"
    float(0)
    float(NAN)
    bool(false)
    With the official 5.2.9 or 5.2.10-dev builds it's "true" on the same
    machine
    (xp sp3).


    BTW: is_nan($realNaN) is working with the official build.

    is this fixed? and if not .. is there a bug ticket open?

    regards,
    Lukas Kahwe Smith
    mls@pooteeweet.org
  • Pierre Joye at Jun 18, 2009 at 2:37 pm
    On Thu, Jun 18, 2009 at 4:15 PM, Lukas Kahwe Smithwrote:
    On 24.05.2009, at 11:53, Carsten Wiedmann wrote:

    Hello,
    var_dump(NAN); // float(0), should be float(NAN)
    $realNaN = sqrt(-1);
    var_dump($realNaN); // float(NAN)
    var_dump($realNaN == $realNaN); // true, should be false, NaN should
    never match NaN
    That's interesting. With my own 5.2.9 build (vc6), I have "false" in the
    last test (comparing the variable):
    # php -n -r "var_dump(NAN);$n=sqrt(-1);var_dump($n);var_dump($n==$n);"
    float(0)
    float(NAN)
    bool(false)
    With the official 5.2.9 or 5.2.10-dev builds it's "true" on the same
    machine
    (xp sp3).


    BTW: is_nan($realNaN) is working with the official build.

    is this fixed? and if not .. is there a bug ticket open?
    It is fixed (there was a bug, do not have it at hand).

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