'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 finding hacking loopholes
i was attacked by a redirect php injection
my pc is clean of viruses
so i figure that
INSERT for date range
Hi all
I have the following table
Code: [Select] `date` date
`day` int(2)
`
PHP page is blank
Hi Everyone,
I have a site in which I am able to open the first PHP webpage in my browser but
echo $rows help
Hi all,
Hopefully something simple that I don't know!
I have this:
Code: [Selec
php + mysql count consecutive data
I have a database of values and I want to work out how to display them if the values match a consecu
How to Create a Dynamic table
col1 col2 date1 date2 date3 date4..........
a b v1 v2 v3 v4
How to file_get_contents when login required?
Hello!
I am trying to read data from a page that you have to be logged into to view, I am try
rename the file
File.txt
Code: ***DOCUMENT***
..DN:
000044255
..CB:
..SN:
..PY:
2009
..E
PHP Session Issue
I'm having an issue with one section on my website dealing with sessions. Now I know that myself and
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