'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
RTF fomatting to email content
Im trying to sen an email with content is picked up from a rtf-file (file_get_contents('*.rtf'). Mai
type check while uploading
Hi Everyone,
How can I check the exact type of a file while uploading on my site?
Here
MySQL noob question
hi guys
I have a simple mysql table set up, along the lines of
Col 1 - Col 2 - Date_l
Is this Safe or Unsafe?
Hi i made a few pages with lots of peoples help now i just want to know if they are safe or not can
InternetOpenUrl() Invalid cert
Hi all,
Does anyone know how to prevent calls to InternetOpenUrl() from failing with erro
Display Database
I need to create a shopping cart. I found this code online: http://conceptlogic.com/jcart/
Unfort
How to store checkbox array in a session, and then be able to add to it?
I'm trying to store an array of checkbox values into a session array, sort of like a shopping cart,
Odd or Even
Inside of a while loop I need to echo several rows of info...easy enough.
In the loop (for th
XML Grouping
I'm using xml_parse_into_struct to get all my elements, but now I need to group them. For example, h
How To Make More Than One Redirection with PHP on the same page?
Hey im trying to do a direction page where it open differently link direction pages every time som