'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
DOMDocument parsing
Hello, I am parsing an xml file from an API which I have converted into a DOMDocument in php. This i
pop3 and fsockopen
So I am able to connect to the pop3 server, log in, and check how many messages there are. I am hav
Locking mysql tables with php
Hi
BACKGROUND:
I have multiple instances of the same php script running in a WAMP environ
MySQL-PHP Query Results Help
Hello all. I'm hoping to be able to get some help in solving a problem with query/rowcount output. I
Receive Rosettanet Message to SAP 4.6c
Dear all ,
My customer will send the PO details by rosettanet message , Is it
have trouble in a if condition
The if below is working ok, it check when indexes, name, zipcode and state are empty.
Code: &
Syntax Help
Code:
im having trouble with that code snipped
Parse error: syntax error, unexpec
PHP IMAGE UPLOAD SCRIPT
Hi for the last week i have been looking for scripts that will upload a photo to a certain folder wh
foreach help.
Hello all,
First time I'm attempting to use a foreach statement and was just wondering if my
Allowing ' and "
Hello everyone,
I am creating a form where users submit information to go into a database. I