'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
Calander layout
Hi i know this sounds like a simple question but i cant find the answer to it anywhere i have added
How can I get my program to read a larger array ??
Hi:
I have this program that reads from an array to do calculations. The array are just t
Problem in String replace program's output
Hi all,
I was trying to make a program which accepts a string and replaces it with another stri
Run function every 5 mins ??
I have a function PostMessage()
How can I run it every 5 mins ??
problem with refreshing
in my site, i have an index page, it has a main div. this main div's content is changing according t
php unable to sent email
Hi, guys, I try to send a email through php but unfortunately the mail unable to sent. Here is my co
Help with php code
Hello, can anyone tell me why this php word trap fails to work,
and the trigger words get blow r
a very simple php header question (sorry!)
Firstly...I do apologise if this annoys anyone....a header error
I'm do not know php &
PHP Script runs on CLI but not through web browser
I am running into an issue that I just can't seem to find the answer to. I have a Windows Server 200
Socket problem
Hello,
Earlier I posted about my problem with my socket script. It took up to 100% CPU usage.