converting .php files to .dhtml

[Ankush Grover]

hey friends,

I want to know how to change all the file types of .php into .dhtml of
a directory.There are few subdirectory under the main directory and
each directory contains many .php files.

I want to convert all the .php files under the main directory and
under its subdirectories to .dhtml.

Thanks & Regards
Ankush Grover