'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 with Get_
ok some how this is not working i am not sure what i am doing wrong here but what this does is when
Displaying pictures
i have worked my way through storing images in directory and storing the location in mySQL db.Now i
Taxonomy? Classification? Categorisation?
Not sure if there is a way around this classification problem
I have a supplier who produces
php/mysql problem
Hey all,
Problem: im trying to setup a shop where people can use a drop-down list to select t
Recognising Revenue daily
Hello.
Has anyone come across daily recognition of deferred income?
We want to implement R
Paypal
Hi all,
I have an advanced basic knowledge of php
I want to try something new for a s
Read from forum
Haven't written anything forever and I would like to get back.
What I'm trying to do is getting t
php include email form with attachment
I have had no luck with finding a email form all over the Internet for various reasons. Some insecur
How do I know when getBounds Method is ready to be called.
I have an application that changes out stylesheets client side. Once I change stylesheet the browse
Form submissing with PHP and JQuery/Ajax
I have searched everywhere, but cannot find a solution for this... I have worked all day trying to g