Extreme Coders

Ubuntu 8.10 released on October 31, 2008.

2008-11-04T06:14:00.000-08:00

New ubuntu 8.10 (Intrepid Ibex) is now available. It has some new features like 3G support, Latest Gnome 2.24 Desktop Environment*, Guest Sessions and many more. You may visit this link for further information.

Download latest ubuntu from here

Ubuntu Desktop edition 8.10 click here
Ubuntu Server edition 8.10 click here
You may request for free CD's click here

An awful day

2008-10-19T04:11:00.000-07:00

I learn a lot, I compromise a little, I forgot many but I did not forget crying. I know i am growing up and boys should not be silly. But there is no control on my mind because my little sister's daughter (Rukhsar) has left me alone to Barishal that's why I cried for her and I can't compromise that.

Earn Money from Scour.com

2008-10-16T07:28:00.000-07:00

Did you hear about Scour? It is the next gen search engine with Google/Yahoo/MSN results and user comments all on one page. Best of all we get rewarded for using it by collecting points with every search, comment and vote. The points are redeemable for Visa gift cards. It's like earning credit card or airline points just for searching. Hit the link below to join and we will both get points!

http://scour.com/invite/smronju/

I know you'll like it!

- Md. Shoriful Islam Ronju

42 Tips for optimizing PHP code

2008-10-13T01:30:00.000-07:00

1. If a method can be static, declare it static. Speed improvement is by a factor of 4.

2. echo is faster than print.

3. Use echo's multiple parameters instead of string concatenation.

4. Set the maxvalue for your for-loops before and not in the loop.

5. Unset your variables to free memory, especially large arrays.

6. Avoid magic like __get, __set, __autoload

7. require_once() is expensive

8. Use full paths in includes and requires, less time spent on resolving the OS paths.

9. If you need to find out the time when the script started executing, $_SERVER[’REQUEST_TIME’] is preferred to time()

10. See if you can use strncasecmp, strpbrk and stripos instead of regex

11. str_replace is faster than preg_replace, but strtr is faster than str_replace by a factor of 4

12. If the function, such as string replacement function, accepts both arrays and single characters as arguments, and if your argument list is not too long, consider writing a few redundant replacement statements, passing one character at a time, instead of one line of code that accepts arrays as search and replace arguments.

13. It's better to use switch statements than multi if, else if, statements.

14. Error suppression with @ is very slow.

15. Turn on apache's mod_deflate

16. Close your database connections when you're done with them

17. $row[’id’] is 7 times faster than $row[id]

18. Error messages are expensive

19. Do not use functions inside of for loop, such as for ($x=0; $x < count($array); $x) The count() function gets called each time.

20. Incrementing a local variable in a method is the fastest. Nearly the same as calling a local variable in a function.

21. Incrementing a global variable is 2 times slow than a local var.

22. Incrementing an object property (eg. $this->prop++) is 3 times slower than a local variable.

23. Incrementing an undefined local variable is 9-10 times slower than a pre-initialized one.

24. Just declaring a global variable without using it in a function also slows things down (by about the same amount as incrementing a local var). PHP probably does a check to see if the global exists.

25. Method invocation appears to be independent of the number of methods defined in the class because I added 10 more methods to the test class (before and after the test method) with no change in performance.

26. Methods in derived classes run faster than ones defined in the base class.

27. A function call with one parameter and an empty function body takes about the same time as doing 7-8 $localvar++ operations. A similar method call is of course about 15 $localvar++ operations.

28. Surrounding your string by ' instead of " will make things interpret a little faster since php looks for variables inside "..." but not inside '...'. Of course you can only do this when you don't need to have variables in the string.

29. When echoing strings it's faster to separate them by comma instead of dot. Note: This only works with echo, which is a function that can take several strings as arguments.

30. A PHP script will be served at least 2-10 times slower than a static HTML page by Apache. Try to use more static HTML pages and fewer scripts.

31. Your PHP scripts are recompiled every time unless the scripts are cached. Install a PHP caching product to typically increase performance by 25-100% by removing compile times.

32. Cache as much as possible. Use memcached - memcached is a high-performance memory object caching system intended to speed up dynamic web applications by alleviating database load. OP code caches are useful so that your script does not have to be compiled on every request

33. When working with strings and you need to check that the string is either of a certain length you'd understandably would want to use the strlen() function. This function is pretty quick since it's operation does not perform any calculation but merely return the already known length of a string available in the zval structure (internal C struct used to store variables in PHP). However because strlen() is a function it is still somewhat slow because the function call requires several operations such as lowercase & hashtable lookup followed by the execution of said function. In some instance you can improve the speed of your code by using an isset() trick.

Example:

if (strlen($foo) < 5) { echo "Foo is too short"; }

vs

if (!isset($foo{5})) { echo "Foo is too short"; }

Calling isset() happens to be faster then strlen() because unlike strlen(), isset() is a language construct and not a function meaning that it's execution does not require function lookups and lowercase. This means you have virtually no overhead on top of the actual code that determines the string's length.

34. When incrementing or decrementing the value of the variable $i++ happens to be a tad slower then ++$i. This is something PHP specific and does not apply to other languages, so don't go modifying your C or Java code thinking it'll suddenly become faster, it won't. ++$i happens to be faster in PHP because instead of 4 opcodes used for $i++ you only need 3. Post incrementation actually causes in the creation of a temporary var that is then incremented. While pre-incrementation increases the original value directly. This is one of the optimization that opcode optimized like Zend's PHP optimizer. It is a still a good idea to keep in mind since not all opcode optimizers perform this optimization and there are plenty of ISPs and servers running without an opcode optimizer.

35. Not everything has to be OOP, often it is too much overhead, each method and object call consumes a lot of memory.

36. Do not implement every data structure as a class, arrays are useful, too

37. Don't split methods too much, think, which code you will really re-use

38. You can always split the code of a method later, when needed

39. Make use of the countless predefined functions

40. If you have very time consuming functions in your code, consider writing them as C extensions

41. Profile your code. A profiler shows you, which parts of your code consumes how many time. The Xdebug debugger already contains a profiler. Profiling shows you the bottlenecks in overview

42. mod_gzip which is available as an Apache module compresses your data on the fly and can reduce the data to transfer up to 80%

This excellent Article about optimizing PHP code by John Lim and this article has been translated in several languages, the newest one is a portuguese translation by Lucas Stephanou. To view the original one Click here

Connecting Nokia Phone to Computer as a Modem Through Infrared

2008-10-13T01:29:00.000-07:00

I've just bought cheap Nokia 6020 with Infrared and GPRS features. Because I want to connected this Nokia 6020 to computer as a modem through Infrared, I got trouble when PC want to sync with Nokia 6020. The message is "Wireless link interrupted the link has been blocked or the device has moved out of range".

Im sure I have plugged the USB IrDA adaptor (SigmaTel USB-IrDA dongle) and the phone position correctly, but the message always appear. Even Windows XP can recognize the Infrared without need to install the driver, I think the problem is in the driver and Nokia PC Suite. So I install the driver and Nokia PC suite, but this solution is not solve the problem.

If your Infrared position is correctly and still see the message "Wireless link interrupted the link has been blocked or the device has moved out of range", When you try to dialup using the Infrared port, try the following solution. In the System Tray, right-click on the Infrared icon and select Properties. Click on the Hardware tab and select Properties.

When the Properties window opens, click on the Advanced tab and select the Infrared Transceiver Type property. Change the value to "Vishay TFD".

You should now be able to use your Infrared port. To make new Internet connection follow this steps:

1. Select Connect to the Internet. Click Next.

2. Select Set up my connection manually. Click Next.

3. Select Connect using a dial-up modem. Click Next.

4. Check the option Infrared Modem. Click Next.

5. Give a name to your ISP. Click Next.

6. Type in the phone number to dialup to your ISP for GPRS access.

7. Select My Use Only. Click Next.

8. Enter your user name and password to login to your ISP.

A new Dial-up Connection icon will be added to the Network Connections icon. Simply double-click on it and click on the Dial button to get connected to the Internet.

This article is from Annis Blog

To view the original article Click here

Ubuntu 8.10 (Intrepid Ibex) Releasing Soon !!!

2008-10-13T01:27:00.000-07:00

The next version of Ubuntu 8.10 (Intrepid Ibex) is releasing soon! This will be the 9th released of ubuntu team. Ubuntu 8.10 is planning a number of new features, such as the development team will prepare an unbelievable desktop, with an amazing performance, that will work on mostly any computer (be it a high-end workstation or an old and dusty Pentium III machine). Another major feature planned for Ubuntu 8.10 is the ability to stay connected to the Internet (to read: wireless connections) wherever you go: "We want you to be able to move from the office, to the train, and home, staying connected all the way." - said Mark Shuttleworth.

Read more Wiki Information.

The final version is under way October 30. A complete and up-to-date list of new features have been published, the Ubuntu forums.
Ubuntu 8.10 release dates and Schedules

* 12 June 2008 - Alpha 1 release
* 3 July 2008- Alpha 2 release
* 24 July 2008 - Alpha 3 release
* 14 August 2008 - Alpha 4 release
* 4 September 2008 - Alpha 5 release
* 18 September 2008- Alpha 6 release
* 2 October 2008- Beta release
* 23 October 2008 - Release Candidate
* 30 October 2008- Final release of Ubuntu 8.10

To Download Ubuntu 8.10 (Intrepid Ibex) Alpha 5 for Desktop Click here
To Download Ubuntu 8.10 (Intrepid Ibex) Alpha 5 for Server Click here

Official Ubuntu Blog : Click here

Google Chrome in Ubuntu !!!

2008-10-13T01:26:00.000-07:00

Install Google Chrome in Ubuntu with Wine

The Linux version of Google’s Chrome web browser is not ready yet. Don’t boot up Windows, if you’re interested in testing it out it’s possible to do so by running Chrome under Wine.

[update] Wine 1.1.4 has been released, and includes fixes for running Chrome.

Changing MAC in Ubuntu

2008-10-13T01:20:00.000-07:00

If you want to change the MAC address in Ubuntu then follow the instructions below....

Open the terminal.
Now suppose : 3x:6b:3c:44:9r:22 is the new mac address you want to assign
Then enter the following command into terminal:

$ sudo ifconfig eth0 down
$ sudo ifconfig eth0 hw ether 3x:6b:3c:44:9r:22
$ sudo ifconfig etho up

Finally Check the new MAC address by using following command

$ ifconfig

Thank You.