'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
how to load a Sys file with system load and call images?
normally you need register the module as a service with CreateService, and start the service
Share admin accross websites
I'm using .net memberships and roles in one of my sites, but I need to be able to share logins and p
Forgot password won't work
My forgot password thing is not working properly. It is giving me this errorMailbox unavailable. The
A problem with my GD class
Hello,
I created a nice (and simple for now) GD class.
The problem is , it works great on
Socket problem
Hello,
Earlier I posted about my problem with my socket script. It took up to 100% CPU usage.
Get dump of MySQL DB from Live Site
I'm after an easy, but secure way of generating and importing a MySQL dump from a remote server.
how to load php class from another domain?
how to load php class from another domain?
What makes a script your own?
If someone finds a login script online, and changes some variable names around and some other minor
Include ("Absolute Path") of a file?
I'm not sure what I'm doing wrong. I am writing my php code in the same directory of the file that
How to create a static html menu from a database
Hi,
I have built a small cms which allows me to create simple html pages and then upload them