20190212_100750_resized

wp_set_auth_cookie( $user_id, $remember, $secure )
This function sets the cookie.

wp_clear_auth_cookie()
This function will delete the cookie from the client browser. This happens when the user clicks on the Logout link in the Administration interface.

auth_redirect()
This function also utilizes the cookies. Checks whether the cookie is present on the client browser. If it is not, the user is sent to the wp-login.php login screen. After logging in, the user is sent back to the page he or she attempted to access.

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