hi every body as i am new to freepbx i also got same problem on linux 9 issue was resolved as you menstion by installing these php librariers . now i get this message " Connecting to database..FAILED
Try running --username=user --password=pass (using your own user and pass) how i should change the user id & password .

Regards

You have to do this

Before you can do anything to MySQL, you need to make sure it's running:
root@rob-laptop:~# /etc/init.d/mysql start
Starting MySQL database server: mysqld.
root@rob-laptop:~#

Now, you must cd to the /usr/src directory and get the source to freepbx using svn:
root@rob-laptop:/usr/src/freepbx# cd /usr/src/
root@rob-laptop:/usr/src# svn co https://svn.sourceforge.net/svnroot/amportal/freepbx/branches/2.2 freepbx-2.2
A freepbx/amp_conf
A freepbx/amp_conf/astetc
... freePBX now downloads ...
Checked out revision 2574.
root@rob-laptop:/usr/src# cd /usr/src/freepbx-2.2

Now, to configure the databases for freePBX:

root@rob-laptop:/usr/src/freepbx# mysqladmin create asterisk
root@rob-laptop:/usr/src/freepbx# mysqladmin create asteriskcdrdb
root@rob-laptop:/usr/src/freepbx# mysql asterisk < SQL/newinstall.sql
root@rob-laptop:/usr/src/freepbx# mysql asteriskcdrdb < SQL/cdr_mysql_table.sql

They also need to be secured, so that not just anyone can access them. freePBX will prompt you for a database password when you do the install. You need to pick that now. We'll assume that you've picked 'asteriskuser' and 'amp109' - you probably shouldn't use these, as they are well known passwords for Asterisk@Home builds. If anyone's trying to attack your machine, they will try this.
root@rob-laptop:/usr/src/freepbx# mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 12 to server version: 5.0.22-Debian_0ubuntu6.06.2-log

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> GRANT ALL PRIVILEGES ON asterisk.* TO asteriskuser@localhost IDENTIFIED BY 'amp109'; (This is the first username and password asked for below)
Query OK, 0 rows affected (0.00 sec)

mysql> GRANT ALL PRIVILEGES ON asteriskcdrdb.* TO asteriskuser@localhost IDENTIFIED BY 'amp109';
Query OK, 0 rows affected (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql> \q
Bye
root@rob-laptop:/usr/src/freepbx#

Now, after all of this, you need to pick a root 'mysql' password. For this, we'll pretend it's 's33kret'. If you need to do anything else with mysql, you'll need to provide this password.
root@rob-laptop:/usr/src/freepbx# mysqladmin -u root password 's33kret'