ID: 10313 Comment by: JOB-HAND1846 at hotmail dot com Reported By: faxguy at deanox dot com Status: Closed Bug Type: *Math Functions Operating System: RedHat Linux 7.0 PHP Version: 4.0.4pl1 New Comment:
<a href=http://www.geocities.com/vdzfpwhem6586/>HAND JOB</a> Previous Comments: ------------------------------------------------------------------------ [2001-04-13 14:35:03] [EMAIL PROTECTED] This isn't a bug. PHP uses the underlying C library to round, and all known C library's do this the same. Actually, you are reporting a bug for MySQL, so please ask on there bug list for this. ------------------------------------------------------------------------ [2001-04-12 22:20:44] faxguy at deanox dot com Using MySQL 3.23.32 on RedHat Linux 7.0... MySQL's ROUND function rounds 5 up when the preceding digit is odd and down when the preceding digit is even. mysql> select round(1.5); +------------+ | round(1.5) | +------------+ | 2 | +------------+ 1 row in set (0.00 sec) mysql> select round(2.5); +------------+ | round(2.5) | +------------+ | 2 | +------------+ 1 row in set (0.00 sec) I think that this is technically the correct behavior, scientifically, anyway. However, this is not the common "lay-man's" method of rounding, which is to always round 5 up, as exhibited by PHP-4.0.4pl1... <? echo round(1.5); ?> <br> <? echo round(2.5); ?> Apache 1.3.14 output for this is: 2 3 This discrepancy causes a difficulty in programming PHP and MySQL together, for example, because all of the rounding must be done in either PHP or MySQL but not both partially unless you want conflicting data. I would like to see MySQL ROUND() syntax expand to be ROUND(X,D,M) where optional M value indicates the method of rounding, the default being the current method. I would also like to see PHP round() syntax expand to be double round (double val [, int precision] [, char method]) where the optional method value indicates the method of rounding, the default being the current method. Thanks. Lee Howard ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=10313&edit=1
