PHP analytics

Hello I am new to php and I would like some guidance from those who have a bit more expereince with PHP I will be attempting to do a bit of tracking and web analytics. Basically, the user will login and from there everything that he clicked will be recorded in a database and analyzed i.e user behaviour, patterns with different user groups. Is this possible with php and it is a major undertaking ? just trying not to get ahead of myself here.. are there any tutorials or scripts or books that you know of ? Thanks Regards Rick