Q: can anyone recommend a php keyword density code? 
Possible Duplicate:
What is Keyword Density and how to create a script in PHP? 

Can anyone recommend a good implementation of php code which calculates keyword density in a string?

A: This is a great question Yoav, I think there are some good resources for this in google free projects I saw, and I also saw this service that gives good results:
http://www.webconfs.com/keyword-density-checker.php
