how can i make:
register, login and logout?
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how can i make:
register, login and logout?
Thats a loadfull.
To register users you would probably want to use a database (MySQL is a free one).
For the rest of your authentication/authorization, you would either need to use an open source project out there to accomplish what you need, or you can build one from scratch.
To start, you will need to go through a tutorial on sessions. Here is a good one:
http://www.w3schools.com/php/php_sessions.asp