Protect files in folder on hosting linux using codeigniter php

Im doing a little application write in php with codeigniter hosted in hostinglinux i had no problems with create codeigniter interface with user login to access the application

now i have a problem… i want to create some folder for the user to store some .pdf file like this picture

what can i do to protect every single users folder with the same password to login in the codeigniter application ? my idea/goal is

username:user_a pass:pass_user_a

for displayng the files in the folder of user_a (that is on hosting linux) the user must insert the password

anyone can help me ? sorry for the baddest english ever

Answer

You have a solution in the following link which use CI framework and session to protect each user file:

Solution for document protection with session in CodeIgniter