#45970 [NEW]: Weird rounding behaviour

From: jan dot vernieuwe at webline dot be Operating system: FreeBSD PHP version: 5.2.6 PHP Bug Type: Math related Bug description: Weird rounding behaviour Description: ------------ Rounding a calculated float gives bad results, rounding it as a string works as intended. Reproduce code: --------------- <?php echo "<pre>"; $total = 332.145; $substract = 274.5; $myVal = $total-$substract; var_dump($myVal); var_dump(round(57.645,2)); var_dump(round($myVal,2)); var_dump(round("$myVal",2)); echo "</pre>"; ?> Expected result: ---------------- float(57.645) float(57.65) float(57.65) float(57.65) Actual result: -------------- float(57.645) float(57.65) float(57.64) float(57.65) -- Edit bug report at http://bugs.php.net/?id=45970&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45970&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45970&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45970&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=45970&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=45970&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=45970&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=45970&r=needscript Try newer version: http://bugs.php.net/fix.php?id=45970&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=45970&r=support Expected behavior: http://bugs.php.net/fix.php?id=45970&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=45970&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=45970&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=45970&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45970&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=45970&r=dst IIS Stability: http://bugs.php.net/fix.php?id=45970&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=45970&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=45970&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=45970&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=45970&r=mysqlcfg