#47449 [NEW]: Mathenatical comparison of an expression with it's result returns false

From: office at devstudio dot ro Operating system: Windows, FreeBSD, Linux PHP version: 5.2.9RC2 PHP Bug Type: Feature/Change Request Bug description: Mathenatical comparison of an expression with it's result returns false Description: ------------ Mathenatical comparison of an expression with it's result returns false When I try to compare 1.5 * 0.19 with it's result, 0.285, PHP returns false, but when i display the result 1.5 * 0.19 it echoes 0.285. Reproduce code: --------------- <?php // BUG!!! This expression should return TRUE, because 1.5 * 0.19 is 0.285 echo ((1.5 * 0.19) == 0.285) ? "TRUE" : "FALSE"; echo "<br />"; echo "<br />"; // Mathematical representations are the same echo sprintf("%e", 1.5 * 0.19); echo "<br />"; echo "<br />"; echo sprintf("%e", 0.285); echo "<br />"; echo "<br />"; // This expression is TRUE, that's correct echo (0.285 == 0.285) ? "TRUE" : "FALSE"; echo "<br />"; ?> Expected result: ---------------- This expression should return TRUE, because 1.5 * 0.19 is 0.285 Actual result: -------------- Actual result is FALSE -- Edit bug report at http://bugs.php.net/?id=47449&edit=1 -- Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=47449&r=trysnapshot52 Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=47449&r=trysnapshot53 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=47449&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=47449&r=fixedcvs Fixed in CVS and need be documented: http://bugs.php.net/fix.php?id=47449&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=47449&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=47449&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=47449&r=needscript Try newer version: http://bugs.php.net/fix.php?id=47449&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=47449&r=support Expected behavior: http://bugs.php.net/fix.php?id=47449&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=47449&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=47449&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=47449&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=47449&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=47449&r=dst IIS Stability: http://bugs.php.net/fix.php?id=47449&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=47449&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=47449&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=47449&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=47449&r=mysqlcfg