Bug #63074 [NEW]: Intval doesn't return exact value

From: berthonneau dot olivier at gmail dot com Operating system: Windows Server 2008 and Ubuntu PHP version: 5.3.16 Package: Math related Bug Type: Bug Bug description:Intval doesn't return exact value Description: ------------ Hi! I found a strange bug today. I have a float variable which contains 3876.0000, I want to pass it through the intval() function. I know it's already an integer because there is no decimals, but the strange thing is that intval() don't return 3876 but 3875. I experience the same thing with explicite cast. Test script: --------------- $tmp = 1370 * 1.15; echo $tmp . "<br />"; // echo 3875.5 $tmp += 0.5; echo $tmp . "<br />"; // echo 3876 $tmp = intval($tmp); echo "tmp= ". $tmp . "<br />"; // echo 3875 ======== Same thing with an explicite cast: $tmp = (int)$tmp; Expected result: ---------------- I expect that the last echo output 3876 Actual result: -------------- The last echo output 3875 instead of 3876. -- Edit bug report at https://bugs.php.net/bug.php?id=63074&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=63074&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=63074&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=63074&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=63074&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=63074&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=63074&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=63074&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=63074&r=needscript Try newer version: https://bugs.php.net/fix.php?id=63074&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=63074&r=support Expected behavior: https://bugs.php.net/fix.php?id=63074&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=63074&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=63074&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=63074&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=63074&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=63074&r=dst IIS Stability: https://bugs.php.net/fix.php?id=63074&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=63074&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=63074&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=63074&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=63074&r=mysqlcfg