App to remove comments from PHP files.

I have thousands of PHP files in many folders that have comments in them. I want the comments removed from all of these files. Then I want it to save the file after removing the comments. The folders are deep more than 10 folders in at times. And there is more than 5,000 files. There are open source tools available but they do not work with the scale of files I am converting. I also am not looking to pay more than $30 for this.