Friends
i,m new to PHP & i,m doing my best to learn it but after installing PHPdev software & when following up book & educational site it always gives me a message which says (PHP complier was not found)
can any expert tell how how to overcome this problem
thank you

sounds like it is not finding the php files on your host. Contact your host and they should help.

I don't know phpdev, but try xampp:
http://www.apachefriends.org/en/xampp.html

I never had much troubles with it.
it installs and configure php, mysql and apache. You simply create your files in it's web directory and access them through your browser with http://localhost/file.php

I agree about xampp, as it is currently what I use to do local development on my PC. It is reliable and creates and starts all the services you need. If you're trying to develop on a remote host, then talk to your hosting provider as WendallB suggested. Have you tried the standard test to see if PHP is running?

<?php phpinfo(); ?>

If that doesn't work, you have problems.

Also, not to be too pedantic, but PHP isn't compiled, it is interpreted.