Comments on: Did I find a php bug?

By: shaman4d

shaman4d — Wed, 13 May 2009 16:15:46 +0000

This is bug not only in php, it is number round bug in all programming languages with float point math.

By: bob

bob — Wed, 06 Feb 2008 17:55:43 +0000

Actually, the 1 just shows it’s repeating. Like on a calculator it shows .00000001 or .111111112 or .2222222223, etc.

By: Dale Hay

Dale Hay — Sun, 03 Feb 2008 02:01:43 +0000

I have tested it on my localhost (Using Apache, PHP & MySQL… *cough* AppServ *cough*) and mine reads 0.9 as the answer. :D

By: shedokan

shedokan — Fri, 25 Jan 2008 15:19:49 +0000

I get 0.9 with xampp server

By: Shadow Scythe

Shadow Scythe — Sat, 01 Dec 2007 10:28:56 +0000

If it becomes a problem in programming, try using Math.round. And in your case, since you’re using tenths, try Math.round($a*10)/10. Hopefully that’ll fix it.

By: ben

ben — Wed, 28 Nov 2007 03:48:21 +0000

I am taking programming languages class this semester. We are writing our programming language, compiler, interpreter so on. this is not a bug. I dont want to get depth about p.l. but I can say that php doesnt have data types. it allows you really flexible features, but if you are making calculations you have to handle your data

By: V34

V34 — Sat, 17 Feb 2007 15:58:20 +0000

Of what I remember it has something to do with this.
http://en.wikipedia.org/wiki/0.999

Hope it’s OK I testes the BBCodes.
[code]Test[/code][b]Test[/b][url]http://test.dk[/url]

By: Xera

Xera — Thu, 18 Jan 2007 12:57:03 +0000

That’s not a bug, http://php.net/float

Xera

By: Josh

Josh — Sat, 13 Jan 2007 00:18:19 +0000

That’s pretty common in many languages. I’ve encountered this behavior in Flash a few times too. It happens because floating point math isn’t completely accurate, and mathematical operations can cause you to lose precision. It’s not really the language, but the computer architecture.

By: sinatosk

sinatosk — Fri, 12 Jan 2007 20:04:52 +0000

no your not the only one :p. I’m using php 5.1.6