In this article you have learned how to improve the inefficient method of using a database to track users, and created a sleek file-based version of the "users online" counter. There are a number of ways to implement this script on your site, namely just changing session.auto_start to 1 in php.ini.
This article also sends an important message about overall efficiency. Whether it's getting rid of an unnecessary loop, or completely rewriting the database structure, improving coding efficiency is an extremely important part of the development cycle and this process should not be overlooked. Take a look at each piece of code that you write and ask yourself, "Is this the most efficient solution for this problem?".
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