LAMP is an acronym for a solution stack of free, open source software, originally coined from the first letters of Linux (operating system), Apache HTTP Server, MySQL (database software) and Perl/PHP/Python, principal components to build a viable general purpose web server
The exact combination of software included in a LAMP package may vary, especially with respect to the web scripting software, as PHP may be replaced or supplemented by Perl and/or Python. Similar terms exist for essentially the same software suite (AMP) running on other operating systems, such as Microsoft Windows (WAMP), Mac OS (MAMP), Solaris (SAMP), or OpenBSD (OAMP).
In this post will show you how to install LAMP in Mandriva 2011
I-  Install Apache :
Apache2 is available as a Mandriva package, just install with this command
urpmi apache-mpm-worker
Now start Apache:
/etc/init.d/httpd start
Check the page    with http://hostname or http://IP
II-install Mysql the Server and the client :
Open terminal and enter the following commands:
urpmi mysql mysql-client -a
start the Mysqld with
/etc/init.d/mysqld start
Make the root password  with the command mysql_secure_installation
#mysql_secure_installation
NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MySQL
SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!
In order to log into MySQL to secure it, we’ll need the current password for the root user. If you’ve just installed MySQL, and you haven’t set the root password yet, the password will be blank, so you should just press enter here.
Enter current password for root (enter for none)
III- Install php
Install PHP using the command:
urpmi apache-mod_php
After this  you have to restart apache
  /etc/init.d/httpd restart
Check the php page  with by creating a file
add this code to one file in apache like test.php  (with vi  nano or gedit )
vi /var/www/html/test.php
and add
{codecitation}
{ {/codecitation} save and exit
Now check the page
http://ip/test.php
IV- install phpmyadmin
If more  comrortable mysql manager  you have to install   phpmyadmin
urpmi phpmyadmin
open the  browser on http://ip/phpmyadmin and login with root and root  password of mysql server
Enjoy