Single Sign On (SSO)
Single sign-on (SSO) is a property of access control of multiple related, yet independent, software systems. With this property, a user logs in with a single ID and password to gain access to a connected system or systems without using different usernames or passwords, or in some configurations seamlessly sign on at each system. See more about SSO https://en.wikipedia.org/wiki/Single_sign-on.
This is simple simulation Single Sign On (SSO) with PHP Native, PDO Ekstension, and MySQL for database.
Execute this script to run the server
APP Provider
php -S 127.0.0.1:80 -t provider\
Client 1
php -S 127.0.0.2:80 -t client1\
Client 2
php -S 127.0.0.3:80 -t client2\