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

ID: 24142 Comment by: webmaster at ragnarokonline dot de Reported By: infohata at firmos dot net Status: Bogus Bug Type: Zend Engine 2 problem Operating System: Linux PHP Version: 5.0.0-dev Assigned To: stas New Comment: uhm, anyone? Previous Comments: ------------------------------------------------------------------------ [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 $res): 5.045 TI-32: 5.045 With pen and paper: 5.045 Round 5.045 with precision of 2 == 5.05 So I think PHP 4.3.2 actually works as expected and anything before (and after, PHP 5? :) doesn't. Reclassified as ZE2 bug. ------------------------------------------------------------------------ [2003-06-16 12:10:33] derick@php.net Stas, I was so free to assign this to you :) ------------------------------------------------------------------------ [2003-06-16 12:09:50] derick@php.net hmm, actually this changed between PHP 4.2.2, PHP 4.2.3 an PHP 4.3.0: [derick@kossu derick]$ cat foo.php <?php $mul = 1; $one = 5; $two = 0.9; echo sprintf("%1.2f", round($mul * round($one * (1 + ($two / 100)), 2), 2)); ?> [derick@kossu derick]$ php-4.2.2 foo.php 5.04 [derick@kossu derick]$ php-4.2.3 foo.php 5.05zend_hash.c(98) : Bailed out without a bailout address! [derick@kossu derick]$ php-4.3.0 foo.php 5.05 [derick@kossu derick]$ php-4.3.0dev foo.php 5.05 [derick@kossu derick]$ php-5.0.0dev foo.php 5.04 So something is definitely screwed in the PHP_4_3 branch Derick ------------------------------------------------------------------------ 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