Bug #78172 [NEW]: Wrong rounding up/down when decimal places are specified

From: vecera at zdenekvecera dot cz Operating system: Windows, Linux PHP version: 7.1.30 Package: *Math Functions Bug Type: Bug Bug description:Wrong rounding up/down when decimal places are specified Description: ------------ var_dump(round(1.44444, 3, PHP_ROUND_HALF_DOWN)); // float(1.444) OK var_dump(round(1.55555, 3, PHP_ROUND_HALF_DOWN)); // float(1.556) BUG (correct value: 1.555) var_dump(round(1.77777, 3, PHP_ROUND_HALF_DOWN)); // float(1.778) BUG (correct value: 1.777) var_dump(round(1.44444, 3, PHP_ROUND_HALF_UP)); // float(1.444) BUG (correct value: 1.445) var_dump(round(1.55555, 3, PHP_ROUND_HALF_UP)); // float(1.556) OK var_dump(round(1.77777, 3, PHP_ROUND_HALF_UP)); // float(1.778) OK // PHP version: 7.0.33, 7.1.30, 7.2.19, 7.3.6 -- Edit bug report at https://bugs.php.net/bug.php?id=78172&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=78172&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=78172&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=78172&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=78172&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78172&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78172&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78172&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78172&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78172&r=support Expected behavior: https://bugs.php.net/fix.php?id=78172&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78172&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78172&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78172&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=78172&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=78172&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78172&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78172&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78172&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78172&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78172&r=mysqlcfg