What is the session_register php function used for?

Just like the title says, what is the function session_re开发者_StackOverflowgister( ) used for?

http://php.net/manual/en/function.session-register.php

session_register() accepts a variable number of arguments, any of which can be either a string holding the name of a variable or an array consisting of variable names or other arrays. For each name, session_register() registers the global variable with that name in the current session.

This function simply adds a variable to the superglobal $_SESSION array which is used for keeping data for the current session.

A cookie is created in the user's browser, and when the ID in that cookie matches the ID of a session that your server has set up, it sets the $_SESSION array to that matching the ID.

Then this function sets a global pointing to your element in the $_SESSION array.

Note In order to use this function, you'll need to first initialize a session using session_start().