#44803 [Bgs]: round()

ID: 44803 User updated by: oguzhanozbay at yahoo dot com Reported By: oguzhanozbay at yahoo dot com Status: Bogus Bug Type: Unknown/Other Function Operating System: ýss isapi & apache 2.2 PHP Version: 5.2.5 New Comment: ; The number of significant digits displayed in floating point numbers. precision = 14 This my php.ini precision config. I make it 30 (and resart server) but nothing changed. same server, same config -> echo 60000000*(10.5); output 6.3E+8 echo 6000000000000*10; output 60000000000000 How can "60000000*(10.5)" need much precision than "6000000000000*10"? Previous Comments: ------------------------------------------------------------------------ [2008-04-23 00:47:34] felipe@php.net Floating point values have a limited precision. Hence a value might not have the same string representation after any processing. That also includes writing a floating point value in your script and directly printing it without any mathematical operations. If you would like to know more about "floats" and what IEEE 754 is, read this: http://docs.sun.com/source/806-3568/ncg_goldberg.html Thank you for your interest in PHP. ------------------------------------------------------------------------ [2008-04-22 23:41:06] oguzhanozbay at yahoo dot com Description: ------------ How can it be! Reproduce code: --------------- echo round(60000000*10.5); output 6.3E+8 !!! echo round(60000000*(10.5)); output 6.3E+8 !!! echo round(60000000*(10.5),2); output 6.3E+8 !!! echo round(70000000*(10.5)); output 7.35E+8 !!! echo round(70000000*(11.5),2); output 805000000 => true ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=44803&edit=1