PHP Basics In this lesson of the PHP tutorial, you will learn... 1. How PHP works. 2. To write a simple PHP page. 3. To understand and work with simple PHP variables. 4. To use PHP operators. 5. To pass values from one page to another via the URL. How PHP Works When a user navigates in her browser to a page that ends with a .php extension, the request is sent to a web server, which directs the request to the PHP interpreter.