Protects against cross-site request forgery attacks.
Saves the current PHP session.
Statistical analysis is the processing and presentation of data on user actions and interactions on websites and apps (e.g. number of page visits, number of unique visitors, number of returning visitors, entry and exit pages, dwell time, bounce rate, button actuation) and, where applicable, the classification of users into groups based on technical data on the software settings used (e.g. browser type, operating system, language setting, screen resolution).