'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 Like 53 Dislike
Previous forums Next forums
Other forums

Will this protect from mysql injection?
I do not want anything like DROP TABLE to work or any type of coding..

Heres my code.. is it

Clean URLs
Hi I was wandering if anyone has ever implemented URLs on their PHP run website using URLS like wiki

Convert Binary String to Decimal
Trying to Get:
Decimal: 305419896

Out of:
Binary String: xV4

OPINIONS WANTED
This is my login page code, and I want your opinion on it please!

Code: // Login ~ CHECKS

unexpected T_VARIABLE error
Hey all! I'm getting an unexpected T_VARIABLE with the following function:

function getHighes

weeks in a year
hi,

i found this snippet on php.net
QuoteFor the week number for weeks starting on Sunday:

Disable html within defined tags
I have a mysql database that allows users to enter content with html, but I also want to have a tag

newbie error
what is wrong with this code ?

<html>
<body>

<?

DateTimeZone::listIdentifiers headache
http://php.net/manual/en/datetimezone.listidentifiers.php


So the documentation states tha

Find only certain URLs from page ... regex (semi-complete script)
Hi guys,

What I need to do is take a page & extract all the URLs from the page &a

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash