#24142 [Com]: round() does 5.045 to 5.04 instead of 5.05

ID: 24142 Comment by: php at oostende dot nl Reported By: infohata at firmos dot net Status: Closed Bug Type: Zend Engine 2 problem Operating System: Linux PHP Version: 5.0.0-dev Assigned To: stas New Comment: I have the same problem, wrote a testscript (in dutch, sorry, but I'm sure you'll get the idea...) that does basic VAT calculation. Look at http://www.tsrfietsplan.nl/rekentest.php A small comment on the statement that rounding it this way saves money on the long run: if I use this code for VAT calculation, I'll get lots of credit notes and unhappy customers. Not good for business! Previous Comments: ------------------------------------------------------------------------ [2003-08-09 11:16:13] iliaa@php.net This bug has been fixed in CVS. In case this was a PHP problem, snapshots of the sources are packaged every three hours; this change will be in the next snapshot. You can grab the snapshot at http://snaps.php.net/. In case this was a documentation problem, the fix will show up soon at http://www.php.net/manual/. In case this was a PHP.net website problem, the change will show up on the PHP.net site and on the mirror sites in short time. Thank you for the report, and for helping us make PHP better. ------------------------------------------------------------------------ [2003-07-26 10:16:10] webmaster at ragnarokonline dot de uhm, anyone? ------------------------------------------------------------------------ [2003-07-16 04:00:23] webmaster at ragnarokonline dot de The test-case hasn't been corrected for PHP 4.3.3-dev ------------------------------------------------------------------------ [2003-06-16 14:16:12] sniper@php.net Should always test myself and not trust others: # /usr/src/web/php/php5/sapi/cli/php -n t.php 5.04499999999999992894573 5.04999999999999982236432 5.04999999999999982236432 5.05 No bug anywhere. ------------------------------------------------------------------------ [2003-06-16 14:00:55] sniper@php.net With this script: <?php $mul = 1; $one = 5; $two = 0.9; ini_set("precision", 24); $res = 5 * (1 + (0.9 / 100)); $bar = round($res, 2); $foo = round(1 * $bar, 2); echo $res, "\n", $bar, "\n", $foo, "\n"; echo sprintf("%1.2f", $foo); ?> Result with PHP 4.3.3-dev: 5.04499999999999992894573 5.04999999999999982236432 5.04999999999999982236432 5.05 Result with PHP 4.2.3: 5.04499999999999992894573 5.04000000000000003552714 5.04000000000000003552714 5.04 Nokia 6120 (the $res): 5.045 TI-32: 5.045 With pen and paper: 5.045 Round 5.045 with precision of 2 == 5.05 So I think PHP 4.3.2 actually works as expected and anything before (and after, PHP 5? :) doesn't. Reclassified as ZE2 bug. ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/24142 -- Edit this bug report at http://bugs.php.net/?id=24142&edit=1