Bug #70316 [NEW]: round function bug

From: 277460173 at qq dot com Operating system: linux nginx PHP/5.4.41 PHP version: 5.4Git-2015-08-21 (Git) Package: *General Issues Bug Type: Bug Bug description:round function bug Description: ------------ $source=1370.72; $local=1238.265; $aa=($source - $local) / $source; dump($aa); $bb= round($aa,4); dump($bb); dump(phpversion()); result: float(0.09663169721022523) float(0.09660000000000001) string(6) "5.4.41" Test script: --------------- $source=1370.72; $local=1238.265; $aa=($source - $local) / $source; dump($aa); $bb= round($aa,4); dump($bb); dump(phpversion()); Expected result: ---------------- float(0.09663169721022523) float(0.0966) string(6) "5.4.41" Actual result: -------------- float(0.09663169721022523) float(0.09660000000000001) string(6) "5.4.41" -- Edit bug report at https://bugs.php.net/bug.php?id=70316&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70316&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70316&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70316&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70316&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70316&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70316&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70316&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70316&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70316&r=support Expected behavior: https://bugs.php.net/fix.php?id=70316&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70316&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70316&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70316&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70316&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70316&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70316&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70316&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70316&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70316&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70316&r=mysqlcfg