OK, OK, the previous note helped get me started, but really, it took me most of the day to figure out how to get this "pear install ps" to work. At first, it seemed geared for PHP4. Hopefully, I can save someone the day I just spent. (Don't get me wrong, I learned something new).
If the above statement doesn't work try this because it worked for me using PHP5 and Apache.
1. Forget the "pear install ps", it doesn't work. Whoever wrote that should get punched.
2. Make sure you've got PHP5 and Apache working as you like.
3. Go to http://pecl.php.net/package/ps and download the latest release.
4. Decompress the contents into its own directory somewhere.
5. Read http://www.php.net/manual/en/install.pecl.phpize.php which tells you what to do with what you just decompressed.
6. Move the final result (a shared object file) into the directory specified by your php.ini file's "extension_dir".
7. Create an entry in you php.ini (along with other similar statements that should already be there) that says "extension=ps.so"
8. For giggles, restart apache
Worked for me, hope it works for you...