'210010106140040100' == '210010106140040101'
Posted on
16th Feb 2014 07:03 pm by
admin
Debugging this simple line of a PHP script
Code: if($a == $b){ }
I've found that with value of
Did you know?Explore Trending and Topic pages for more stories like this.
$a = '210010106140040100' (type = string)
$b = '210010106140040101' (type = string)
the result of the comparison is TRUE
the same if i compare 2 integer
$a = 210010106140040100 (type = int)
$b = 210010106140040101 (type = int)
$a == $b ( true )
If I use the === operator
'210010106140040100' === '210010106140040101' (comparison of strings: result is FALSE)
210010106140040100 === 210010106140040101 (comparison of numbers: result is TRUE)
I think it could be caused by the fact that the string is 'like' integer, but exceed the standard size of integer number.
But the final result remain a mistery for me: I've tested some others 'big' numbers and I've found for example:
18014398509481980==18014398509481981 (true) !!!!
18014398509481982==18014398509481981 (false) !!!!
In my specific script i can handle this specific comparison using the === operator, because i can assume that the variable are string.
But i'd like to know why this happen, and i'd appreciate suggestions about how to efficiently compare 'big' integers.
Thanks!
I use PHP 5.2 with IIS
No comments posted yet
Your Answer:
Login to answer
199
53
Other forums
convert static html data into dynamic
hi all
i need to convert a website which has static above 2000 articles into dynamic and add
Displaying returned XML in another PHP page
I have an online payment form that will return XML given if a payment is successful or declines. I
why aint this working?
i have this code:
Code: $num = 250;
$count = ($num - $rcount);
echo $rc
Help With editting and deleting form
Hallo !!
So look at this image :
http://img194.imageshack.us/img194/8272/snapshot5f.pn
The IE or FF detector
Hello Friends,
Problem of today ( we seek for php help ) as following ,
we know all th
Spaghetti Code
So.
I've pretty much reached the point where I have so many isset s on one page that I can't
List/Menu Box
On an edit page when you want something to select what a user has previously selected from the datab
Slashes
Have a small problem and I'm not able to understand why I'm getting the results I'm getting... and i
problem with query error
First Thanks to those who helped me on my previous posts, and the following code i'm using is not mi
Reditecting pages based on logic
Newbie here, apologies in advance!
I am trying to use the header function to forward one of a