where can i find some exercise about php? 
Mean some require and code to make the require that...

'exercise' singular.

'Mean some require and code to make the require that...'

unintelligible.


1. Computer Experience
2. Have webserver and php installed already?
3. Programming experience
4. Goals

search on internet (read google :) )for  
php tutorials exercise reference code (mix and match to optimise result).

If you are looking for a tutorial with an example exercise then this may help.
http://www.sitepoint.com/books/phpmysql1/

I started with this article when it was originally on mysql's website.
The author is now selling it in book form. You may be able to find it
as an ebook on gnuetella.

Here is another article....
http://php.about.com/od/buildingwebapplications/a/addressbook.htm

PHP traning's are all over the web.

You sould start with
1. Downloading and installing a http server (Apache is most common at
http://httpd.apache.org/download.cgi)
2. Download PHP (stable versions are preferred for tranings at
http://www.php.net/downloads.php)
3. Configure your http directory (where the .php\.html files are) on httpd.conf
4. Configure you PHP to work with your http server

Or, you can download XAMPP, all-in-one package with Apache2, PHP5 and
MYSQL from http://www.apachefriends.org/en/xampp.html (Supports Win,
Linux and Mac OSX)

There are several links that I have found for you to train PHP.

a. http://www.fhso.ch/~huesler/php_e/php_ueb1_e.pdf
- PDF file with pictures. (PDF Reader is required. Adobe Acrobat
Reader is most common found at
http://www.adobe.com/products/acrobat/readstep2.html)

b. http://www.phpconsulting.com/training.php

c. http://www.cs.nott.ac.uk/~nxk/TEACHING/G6DHLL/PHP/exercises/PHP-Lab1.pdf

Hope that helps.
Good Traning.