'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
Curl timeout breaks script
So im having difficulties with skipping timeout error in curl
my script calls different functions
Merger of 6 sister companies under one flagship company after go live
Dear Experts,
I need one help regarding Merger of sister companies of same group. currently we
Parse Error
Hi Guys,
I have a function in my class which returns a string link variable. The problem is i
How to secure my login data to my database?
Hi there,
It may be a stupid question but I don't know how to secure my login data to my data
Unexpected T_Variable ?
Hi all,
I dont really know what I am doing!! I know I'm doing something wrong, and I know its on
login and redirect
hello! can someone help me.. can you give me an idea.. I want to make a login page and redirects it
Converting RGB values to HEX
Code: <?PHP
$file_handle = fopen("colors/rgb.csv", "r");
wh
Final year project, please point me in the right direction
hi there for my final year project I'm aiming to build a php script shell to use as an expert system
empty() error
Why does
Code: empty($USER_ID = $_SESSION["USER_ID"])
create this error...
How to login with SAPCPIC userid
I have changed the Password for SAPCPIC in Development Server for 000,001 and 100 client.
But w