#40924 [NEW]: round() precision problem

From: info at e-mhd dot com Operating system: Win & Linux PHP version: 5.2.1 PHP Bug Type: Performance problem Bug description: round() precision problem Description: ------------ Problem with function round() rounded value is incorrect Reproduce code: --------------- ini_set("precision", 15); bcscale(5); $a1 = (string)(3845349 * 34.065); $a2 = (float)(3845349 * 34.065); $a3 = bcmul(3845349, 34.065); echo "A1 = "; var_dump($a1); echo("<br />"); echo "A2 = "; var_dump($a2); echo("<br />"); echo "A3 = "; var_dump($a3); echo "<br />Values after round() :"; echo "<br />A1 = ".round( $a1 ,2); echo "<br />A2 = ".round( $a2 ,2); echo "<br />A3 = ".round( $a3 ,2); Expected result: ---------------- A1 = string(13) "130991813.685" A2 = float(130991813.685) A3 = string(13) "130991813.685" Values after round() : A1 = 130991813.69 A2 = 130991813.69 A3 = 130991813.69 Actual result: -------------- A1 = string(13) "130991813.685" A2 = float(130991813.685) A3 = string(13) "130991813.685" Values after round() : A1 = 130991813.69 A2 = 130991813.68 A3 = 130991813.69 -- Edit bug report at http://bugs.php.net/?id=40924&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=40924&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=40924&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=40924&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=40924&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=40924&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=40924&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=40924&r=needscript Try newer version: http://bugs.php.net/fix.php?id=40924&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=40924&r=support Expected behavior: http://bugs.php.net/fix.php?id=40924&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=40924&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=40924&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=40924&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40924&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=40924&r=dst IIS Stability: http://bugs.php.net/fix.php?id=40924&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=40924&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=40924&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=40924&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=40924&r=mysqlcfg