Bug #66737 [NEW]: 5.5 wrongly rounded to 5

From: mail at daniel-berlin dot de Operating system: Linux PHP version: 5.5.9 Package: Math related Bug Type: Bug Bug description:5.5 wrongly rounded to 5 Description: ------------ 5.5 is wrongly rounded to 5 (even with PHP_ROUND_HALF_UP) Test script: --------------- <?php $n = 2.2459431618637; echo "Expected 5.5 / is " . round(pow(1024, $n - floor($n)), 2, PHP_ROUND_HALF_UP) . "\n"; echo "Expected 5.5 / is " . round(pow(1024, $n - floor($n)), 1, PHP_ROUND_HALF_UP) . "\n"; echo "Expected 6 / is " . round(pow(1024, $n - floor($n)), 0, PHP_ROUND_HALF_UP) . "\n"; echo "Expected 5.50 / is " . number_format(pow(1024, $n - floor($n)), 2) . "\n"; echo "Expected 5.5 / is " . number_format(pow(1024, $n - floor($n)), 1) . "\n"; echo "Expected 6 / is " . number_format(pow(1024, $n - floor($n)), 0) . "\n"; Expected result: ---------------- See output (line 3 and 6 are wrong): Expected 5.5 / is 5.5 Expected 5.5 / is 5.5 Expected 6 / is 5 Expected 5.50 / is 5.50 Expected 5.5 / is 5.5 Expected 6 / is 5 Actual result: -------------- See expected result. -- Edit bug report at https://bugs.php.net/bug.php?id=66737&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=66737&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=66737&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=66737&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=66737&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=66737&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=66737&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=66737&r=needscript Try newer version: https://bugs.php.net/fix.php?id=66737&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=66737&r=support Expected behavior: https://bugs.php.net/fix.php?id=66737&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=66737&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=66737&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=66737&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=66737&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=66737&r=dst IIS Stability: https://bugs.php.net/fix.php?id=66737&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=66737&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=66737&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=66737&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=66737&r=mysqlcfg