Why does this initialization function Report an error ??

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Dude, the word is wrong, right?SessionNoSeesion.

If you use a namespace, all functions should be encapsulated into classes.
The error message session is not defined. I guess you want to perform the following operations:

# If session: echo $ this-> seesion ('URL', CONTROLLER_NAME. '/'. ACTION_NAME) is defined in the Controller );

# If the native SESSION is called: $ _ SESSION ['URL', CONTROLLER_NAME. '/'. ACTION_NAME]; echo $ _ SESSION ['URL'];