ID:               49300
 User updated by:  looris at gmail dot com
 Reported By:      looris at gmail dot com
 Status:           Bogus
 Bug Type:         Unknown/Other Function
 Operating System: debian stable
 PHP Version:      5.2.10
 New Comment:

what are you talking about? string representation?

the second loop loops 8 times, when it should have looped only 7
times.

and using < or <= gives exactly the same result: it still loops for 0.8
when it shouldn't (since i wrote $value<0.8)

I assumed you would notice it but clearly you didn't, I'll be more
descriptive next time.

We do agree that if $value is 0.8, the expression $value<0.8 is FALSE,
now do we?


Previous Comments:
------------------------------------------------------------------------

[2009-08-20 08:58:58] der...@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.

.

------------------------------------------------------------------------

[2009-08-19 20:39:01] looris at gmail dot com

Description:
------------
Just look at the code.

Reproduce code:
---------------
<?php

for ($value=0.1; $value<0.6; $value+=0.1) {
echo $value."\n";
}

echo "\n";

for ($value=0.1; $value<0.8; $value+=0.1) {
echo $value."\n";
}

?>

Expected result:
----------------
0.1
0.2
0.3
0.4
0.5

0.1
0.2
0.3
0.4
0.5
0.6
0.7


Actual result:
--------------
0.1
0.2
0.3
0.4
0.5

0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8


------------------------------------------------------------------------


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