'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
Transform value 0 in no and 1 in yes help needed
Hello,
I have this in the table: "value" type int 0 to represent false and 1 to represe
Conditions of info record - Error
When i created GR (901) and PO create automatic my PBXX is obtain the net price of info record but
checkbox update
I am having a brain fart right now and i cant remember how to do this. if anyone could help that wou
Help If user voted, block them
On my Prayer request site, i let users Click a button to Pray for somone that has posted a pray, i g
Get relative path from absolute path
How would one go about getting the relative path to a file from its absolute path?
grouping within a foreach?
hello all,
I currently have a list of products spit out from my db via a foreach loop. Right
Find occurences of unicode characters in string
I need to prohibit filenames with everything but English characters and numbers but regexp and strin
PHP Cannot redeclare class
I have 6 files, and two of them do not seem to want to play well. I keep getting a "Cannot rede
Dynamic memory problem
Hey,
At the beginning of my code, I have this line:
Shape* gShape = 0;
Load Animated Image while cache is serve
I have a page that loads up using cache and took about 1 to 2 minutes before it loads to the page. <