Cannot access the session array with php

Question

I am working in a subfolder on my website: www.example.com/subfolder

Now, i want to set a session that is only accessible within www.example.com/subfolder

To

Answer 1

_SESSION is superglobal. It is in global scope.

So, you have probably forgot session_start();

Answer 2

Have you used session_start() anywhere before that code ?

I also suggest using var_dump() instead of print_r() to debug values as print_r doesn't output null values, hence creating some confusion sometimes.

Answer 3

You need to call session_start first (unless you have session.auto_start set to 1).