Bug #68065 [NEW]: In some cases intval after floatval gives unexpected results

From: kstirn at gmail dot com Operating system: Windows PHP version: Irrelevant Package: Math related Bug Type: Bug Bug description:In some cases intval after floatval gives unexpected results Description: ------------ See test script - after multiplication and floatval, intval gives unexpected (wrong) result. This only seems to happen with some special initial $a floats, not in all cases. I know floating point precision cannot be trusted, but in this case it may be hard to blame it? Tested on Windows 7 and Linux (CentOS 6) with PHP 5.3.29 and 5.6.0 Test script: --------------- $a = 1.2812; $a = $a * 10000; echo "$a<br>"; $a = floatval($a); echo "$a<br>"; $a = intval($a); echo "$a<br>"; Expected result: ---------------- 12812 12812 12812 Actual result: -------------- 12812 12812 12811 -- Edit bug report at https://bugs.php.net/bug.php?id=68065&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68065&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68065&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68065&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68065&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68065&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68065&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68065&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68065&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68065&r=support Expected behavior: https://bugs.php.net/fix.php?id=68065&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68065&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68065&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68065&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68065&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68065&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68065&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68065&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68065&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68065&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68065&r=mysqlcfg