#44839 [Opn->Bgs]: custom timer class gives incorrect time with sleep(1);

ID: 44839 Updated by: jani@php.net Reported By: kjarli at gmail dot com -Status: Open +Status: Bogus -Bug Type: Unknown/Other Function +Bug Type: *General Issues Operating System: windows xp media center PHP Version: 5.2.5 New Comment: 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. Previous Comments: ------------------------------------------------------------------------ [2008-04-26 10:48:23] kjarli at gmail dot com Description: ------------ When I tried to benchmark my type casting tests, I found out I was getting very, very low numbers. So I added sleep(1); The result was nothing I expected. Reproduce code: --------------- All needed provided in: http://pastebin.org/32109 Expected result: ---------------- To see a time of about 1.00[0-9]* seconds. Actual result: -------------- about 90% of the time, the number of seconds is 0.999[0-9]* Very wierd since I used sleep(1); ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=44839&edit=1