How to count the number of users visited by website without using the session or database?I want to use the file to store the value?can I use?then how?

First of all you can creat a table carrying username and time they visited the site during the day. And at the end you can fire a simple query to database that will count the number of rows in the database. You can creat a flush query which will remove all the data from this table. So everyday count will be number of the users they visited the site throughout the day.