Solved

PHP operator

Posted on 2006-10-25
6
205 Views
Last Modified: 2006-12-28
I'm reading an ebook, it mention about those operators:
^=, &=, |=, <<=, >>=

Can anyone tell me what they are?
Thank in advanced
0
Comment
Question by:tunglam
  • 2
6 Comments
 
LVL 49

Expert Comment

by:Roonaan
ID: 17804151
Those are bitwise operators

$a &= $b is the same as $a = $a & $b (bitwise and)
$a |= $b is the same as $a = $a | $b (bitwise or)

$a <<= 2 is the same as $a = $a << 2 (leftshifting bits)

(leftshifting 2 bits is the same as multiplying by 4, 3 bits is times 8, 4 bits, times 16, etc).

-r-
0
 

Author Comment

by:tunglam
ID: 17811973
Can you what is bitwise operators?
What are they for? And give me some example? Thank you!
0
 
LVL 49

Accepted Solution

by:
Roonaan earned 100 total points
ID: 17812021
Bitwise operators work on binairy forms of data (the zero's and one's.)

So 2 & 3 equals in binairy code 0010 && 0011 => 0010 (only the second one from the right is in both binairy

0101 << 1 is the same as putting all zero's and one's one position to the left: 1010
0101 << 3: 1000
0101 >> 1: (shift to right) 0010
0101 >> 3: 0001

See also: http://nl3.php.net/manual/en/language.operators.bitwise.php

-r-
0
 
LVL 2

Expert Comment

by:_delas
ID: 17942008
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Foreword (July, 2015) Since I first wrote this article, years ago, a great many more people have begun using the internet.  They are coming online from every part of the globe, learning, reading, shopping and spending money at an ever-increasing ra…
I imagine that there are some, like me, who require a way of getting currency exchange rates for implementation in web project from time to time, so I thought I would share a solution that I have developed for this purpose. It turns out that Yaho…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to count occurrences of each item in an array.

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question