'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
Two fgetcsv related questions ;D
First of im trying to get a file from a merchants server but the directory is protected, I know the
Need help adding a timestamp to my filename/variable
Hello,
I'm kind of stupid when it comes to php and I need a tiny bit of help. I've got a f
Buggy registration system
Hey, I just started scripting in PHP, and I ran into a few problems.
Code: <?php
includ
Find occurences of unicode characters in string
I need to prohibit filenames with everything but English characters and numbers but regexp and strin
Linkage between two scripts
Okay say I have this for a link in a script:
Code: <li><a href="#&q
Can't get the unicode character
I'm trying to get some text from various parts of a file. I have converted the file to hex (bin2hex)
help with email script...
hey
I need help with my mail script
when the form on http://www.mcgdesignstudio.com/c
=> and <=
So I was digging through some code when I came across the <= operator. This is the first tim
What am I missing here? Help!
Hello all!. I can't seem to get this working right. Well - it renders right, but something is goin
XML Grouping
I'm using xml_parse_into_struct to get all my elements, but now I need to group them. For example, h