'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
Multiple if statements
Ok so seems basic but for some reason I'm not doing it right. What I want is to be able to have 2 se
Can I call a class inside a function?
I have a class written in another file that handles my image resizing.
Can I do this (php say
Multipe Dynamic Controls & AutoPostback Issue
I currently have a need to create many dynamic controls (Example Textboxes) that need to do a PostBa
Quick variable question
hey guys/gals,
im trying to write a php script and it works fine as i have it, but i need to set
Random date selection
i want to select random date with time(hour+minutes+sec) where date is specified(10/22/2009) and tim
$GPRMC and NMEA how to extract from report
Hi There,
Im a little bi lost and not sure where to start with this one, ive got a small gps
Multiple while loops
I have several DB queries that I know should be returning results and aren't. I have a feeling it ha
Please help with code for SMTP authenticated PHP email form
Hello, I'm creating a PHP email form, and for this particular server, I have to use SMTP Authenticat
Help with usergroups? prolly really quick
So were coding our own forums for a game system we made an we have the users level setup but now I n
Registration
ok so i have a site where people can register and login which works now thanks to someone on here th