'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 Help Optimizing code Good Morning, I wrote a small import function for a website of mine and I know there has to b
Anti Spam Code Problems Ok where do i start? Probably by telling you I have very little working knowledge of PHP and that I
Any decent php formatter/beautifier/pretty printer? Any decent php formatter/beautifier/pretty printer class/function? I found the following whil
Php - mysql store data and use it later? Hi, i' making a login page at the moment, however my username + password is stored many different pl
mysql UPDATE request not working and driving me crazy!!! Hi, I have been stuck on this for ages. Quite simply I am trying to update my database
defining website tags Hi, What would be the best way to define tags for my site, such as website title, url etc.
Accessing element of object array Hello My object looks like this: Array ( [0] => User Object ( [id] =>
selection tool on raster image Hi! I have to implement in my app a selection tool which lets users to select region of any shape
Printing a webpage I use this to print the webpage:
o
DATEDIFF Question First time post, and of course it is a help question. I am using a WP plug-in to display prev