Bug #78071 [NEW]: using 0.9 vs 0.90 gives different results with bcmul

From: terrafrost@php.net Operating system: any PHP version: 7.3.5 Package: BC math related Bug Type: Bug Bug description:using 0.9 vs 0.90 gives different results with bcmul Description: ------------ One would expect 0.9 * -0.1 to yield the same result as 0.90 * -0.1, with BCMath, but alas, this does not appear to be the case. Test script: --------------- <?php $a = bcmul('0.9', '-0.1', 1); $b = bcmul('0.90', '-0.1', 1); echo $a === $b ? 'same' : 'different'; echo "\n$a\n$b"; Expected result: ---------------- I would expect $a === $b to be true. Actual result: -------------- $a === $b is false. $a is 0.0, $b is -0.0. -- Edit bug report at https://bugs.php.net/bug.php?id=78071&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=78071&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=78071&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=78071&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=78071&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78071&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78071&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78071&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78071&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78071&r=support Expected behavior: https://bugs.php.net/fix.php?id=78071&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78071&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78071&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78071&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=78071&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=78071&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78071&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78071&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78071&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78071&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78071&r=mysqlcfg