ID: 43487
User updated by: jm at wo dot cz
Reported By: jm at wo dot cz
-Status: Feedback
+Status: Open
Bug Type: Strings related
Operating System: Linux
PHP Version: 5.2.5
New Comment:
Interesting that you can't reproduce it, I did not expect that,
otherwise I would have provided the build info. Nevertheless, I have
just recompiled php and the bug is still there.
The glibc is 2.3.6 and gcc is 4.2.1.
Here is the build set up:
PHP_CONFIGURE="\
--prefix=/usr \
--sysconfdir=/etc \
--with-config-file-path=/etc \
--disable-static \
--disable-debug \
--disable-rpath \
--enable-inline-optimization \
--enable-pic \
--enable-bcmath \
--enable-calendar \
--enable-magic-quotes \
--enable-track-vars \
--enable-safe-mode \
--enable-sysvsem \
--enable-sysvshm \
--enable-force-cgi-redirect \
--enable-trans-sid \
--enable-yp \
--enable-ftp \
--enable-wddx \
--enable-filepro \
--enable-dbase \
--with-versioning \
--with-gettext \
--with-mod_charset \
--with-layout=GNU \
--with-zlib \
--with-bz2 \
--enable-exif \
--with-regex=system \
--enable-mbstring=all \
--enable-mbregex \
--with-pspell \
--with-mhash \
--with-mcrypt \
--with-curl \
--with-gmp \
--with-openssl \
--with-pgsql=/usr \
--with-gdbm \
--with-xml --with-expat-dir=/usr \
--with-xsl \
--with-apxs2 \
--with-t1lib=/usr/share/t1lib \
--with-freetype-dir=/usr/lib \
--with-gd "
./configure $PHP_CONFIGURE
Previous Comments:
------------------------------------------------------------------------
[2007-12-03 18:41:25] [EMAIL PROTECTED]
Not enough information was provided for us to be able
to handle this bug. Please re-read the instructions at
http://bugs.php.net/how-to-report.php
If you can provide more information, feel free to add it
to this bug and change the status back to "Open".
Thank you for your interest in PHP.
Floats might be imprecise... they shouldn't be wrong. I can't reproduce
this though.
------------------------------------------------------------------------
[2007-12-03 18:16:43] [EMAIL PROTECTED]
Floating point values have a limited precision. Hence a value might
not have the same string representation after any processing. That also
includes writing a floating point value in your script and directly
printing it without any mathematical operations.
If you would like to know more about "floats" and what IEEE
754 is read this:
http://docs.sun.com/source/806-3568/ncg_goldberg.html
Thank you for your interest in PHP.
.
------------------------------------------------------------------------
[2007-12-03 16:53:25] jm at wo dot cz
Description:
------------
Some float numbers are incorrectly converted to string values:
I found it by playing with eval and getting wrong results. Then I did:
echo floatval('3.86e-6'); // output: 3.86E-6
echo floatval('1.01e-6'); // output: 1.01E-6
But
echo floatval('1E-6'); // output: :.0E-7
But one can do:
$f=1E-6;
echo $f; // output: .0E-7
So it must be a problem with float to string conversion.
Reproduce code:
---------------
$f=1E-6;
echo $f; // output: :.0E-7
Expected result:
----------------
1.0E-6
Actual result:
--------------
:.0E-7
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=43487&edit=1
