i just read mod_rewrite module set up in my Apache server! to implement clean url. My apache server is 2.. I can not check this out module during my php info. The way i install this module. Does anyone let me know ?

You may want to enable it using a2enmod rewrite then a restart or reload of Apache.

Within the httpd.conf file uncomment the road LoadModule rewrite_module modules/mod_rewrite.so (take away the pound '#' sign from while watching line)

that's the fundamental way, usually latest version of apache has uncomment this.

In case your using php as CGI you will not see mod_rewrite in phpinfo().
(Or any other apache modules for your matter.)