Are you running a WordPress server and do you want to increase the (standard) file upload size? This article will explain how to increase it in your PHP settings and web server (Apache) settings. As an added bonus, this article will also explain how to increase the file upload size in case you are having your web server behind a reverse proxy (NGINX).
Are you running a WordPress server with Apache? Is your PHP version old, or do you want to change it to a different version? This article explains how to switch PHP versions on your server.