How to recursively change chmod permissions?

Question

SSH

In the current folder for php files:
chmod 644 *.php
In the folder folder for all files:
find folder/ -type d -exec chmod 644 {} \;
How can I change the rights of all files in the folder folder and all files of all folder subfolders and so on to unlimited depth?

Answer 1

man chmod

...
   -R      Change the modes of the file hierarchies rooted in the files
             instead of just the files themselves.
...

chmod -R 644 folder/