Migrate PHP sessions from disk to redis using mass insertion protocol
Download the file, change the php_session_dir and php_session_prefix vars.
Run the script and wait for it to finish, it takes 16min for 120K files on my
slowest system :-D
Usually the script needs to be run with a user with access to php session, that
are usually protected for security reasons.
The script also assumes redis is running and no credentials are necessary, if
this is not the case for you just change the script.