Hi strange here, because i can not reproduce on my installation.(test link : http://limesurvey.sondages.pro/survey/index/sid/562757/newtest/Y)

Can you test with last version please (from today).

If not OK : please : can you put complete PHP info.

With Release 2.05+ Build 140116 please :)

Yes I could reproduce it in http://limesurvey.sondages.pro/survey/index/sid/562757/newtest/Y as well as in my own 2.05+ Build 140116.
It's somehow hard to explain what it is exactly and I might not have pointed out the "trailing space problem" enough. However, I've put together a "comic strip" style explanation of the phenomen (see file 08546.png).
Later in the day I happily send you my anonymized phpinfo.

Yes, you're right: better understanding now : with trailing space it's different.

And it's only trailing space ......

You can do this :
(is_numeric(trim(q1_sq1_sq2.NAOK)) OR is_empty(q1_sq1_sq2.NAOK))

PS: not a server difference, no need phpinfo ;)

Glad not having to send the phpinfo.
Regarding your note 27931: If that's the case - in my understanding - you're willed to have values with trailing spaces in your survey answer's data, aren't you?
The whole thing is a finesse, admittedly, but maybe worth to make LimeSurvey even more perfect.

It's not finesse ;).

But here i really don't know what is best .....

is_numeric("12 ") false or true ? I thing false (like PHP) but not sure it's break another survey.

What is your opinion on this?

And when we export : for OOcalc "12 " become 12 or not ? And for spss ? And for other expression ....
I think we can have difference too if we do:
{q1_sq1_sq2.NAOK+q1_sq1_sq2.NAOK}
with or without trailing space .....

I think the behaviour between PHP and JS should be the same.
PHP uses the us_numeric function.
I suggest to replace the function LEMis_numeric(a) by the PHPJS version here http://phpjs.org/functions/is_numeric/

That way the problem will be gone.

{q1_sq1_sq2.NAOK+q1_sq1_sq2.NAOK}

In JS:
If you put " 12" : you have " 12 12"
If you put "12 " : you have 24

In PHP:
If you put " 12" : you have " 12 12"
If you put "12 " : you have "12 12 "

I fix first LEMval to never rtrim value, see for is_numeric after.

Maybe phpjs can be extrenal for EM, but have a lot of function uneeded (actually).

phpjs seems have same issue here:
PHP : is_numeric("12 ") is false
phpjs: is_numeric("12 ") is true

hehe, lets submit a bug report ;)

ha, I see you already did ;)

Yes and make a pull request:
https://github.com/kvz/phpjs/pull/133

This work good on LS. Do the pull for LS and update with newer pĥpjs if needed (surely better).

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=13713

Fix JS to have same way than PHP.
is_numeric(QQ) with QQ at " 3" is true.

Fix too is_int for all traing slash.
TODO : fix is_float (PHP broken actually)

2.05+ Build 140125 released