Bug #18157: precision ini value affects internal calculations too

From: cnovak@gmx.net Operating system: Windows XP Pro PHP version: 4.2.1 PHP Bug Type: PHP options/info functions Bug description: precision ini value affects internal calculations too By default precision in php.ini is set to 14 significant digits. I would assume, that this is for printing float results only. Instead, the precision argument is used for storing values in databases too. Check the following code: 01 for ($x = 0; $x < 64; $x++) { 02 $group_bitfield = pow(2, $x); 03 print " $group_bitfield<br>"; 04 } The above yields precision errors at 2^48, 2^49, 2^51, 2^52, 2^54. If this is for output only, fine. But the issue is that these values are also _incorrectly_ stored in an INT(20) field on MySQL. Explicit type casting does not help either. Using arbitrary math is not an option for speed and availabilty at various ISP's. Configuration: WINNT Apache/1.3.26 (Win32) mod_ssl/2.8.10 OpenSSL/0.9.6d PHP version: 4.2.1 -- Edit bug report at http://bugs.php.net/?id=18157&edit=1 -- Fixed in CVS: http://bugs.php.net/fix.php?id=18157&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=18157&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=18157&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=18157&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=18157&r=support Expected behavior: http://bugs.php.net/fix.php?id=18157&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=18157&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=18157&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=18157&r=globals