Bug #74665 [NEW]: Floats sum return quirk

From: tomasz dot kane at gmail dot com Operating system: Kubuntu PHP version: 7.1.5 Package: Variables related Bug Type: Bug Bug description:Floats sum return quirk Description: ------------ I'm just calculate array values sum. BTW I know about Floating point precision, but this result... Test script: --------------- $foo = [2.45, -1.05, -1.40]; echo array_sum($foo); // 2.2204460492503E-16 // same result when use foreach $sum += $item Expected result: ---------------- 0 Actual result: -------------- 2.2204460492503E-16 -- Edit bug report at https://bugs.php.net/bug.php?id=74665&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=74665&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=74665&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=74665&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=74665&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=74665&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=74665&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=74665&r=needscript Try newer version: https://bugs.php.net/fix.php?id=74665&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=74665&r=support Expected behavior: https://bugs.php.net/fix.php?id=74665&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=74665&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=74665&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=74665&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=74665&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=74665&r=dst IIS Stability: https://bugs.php.net/fix.php?id=74665&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=74665&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=74665&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=74665&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=74665&r=mysqlcfg