#45978 [NEW]: round() errors.

From: firealwaysworks at gmail dot com Operating system: Linux PHP version: 5.2.6 PHP Bug Type: Math related Bug description: round() errors. Description: ------------ In this example the multiplication of two floats yields a number with 5 significant figures. The round() function incorrectly handles this number only when it is working with the answer to a mathematical operation. It is important to note that the round() function is working properly for static values. I found this because I am writing financial software in PHP. I have absolutely no doubt that this bug would cause our company to loose money. Reproduce code: --------------- print 21.33*1.015."<br>"; print round(21.33*1.015,2)."<br>"; print round(21.33*1.015,4)."<br>"; print round(21.64995,4); Expected result: ---------------- 21.64995 21.65 21.65 21.65 Actual result: -------------- 21.64995 21.65 21.6499 21.65 -- Edit bug report at http://bugs.php.net/?id=45978&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45978&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45978&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45978&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=45978&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=45978&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=45978&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=45978&r=needscript Try newer version: http://bugs.php.net/fix.php?id=45978&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=45978&r=support Expected behavior: http://bugs.php.net/fix.php?id=45978&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=45978&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=45978&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=45978&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45978&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=45978&r=dst IIS Stability: http://bugs.php.net/fix.php?id=45978&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=45978&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=45978&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=45978&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=45978&r=mysqlcfg