About the book: year / PHP is currently one of the most popular languages ​​for implementing web applications. This course is devoted to studying its basics. The emphasis is on the practical application of acquired skills. The PHP language was created to solve a specific practical problem on the Internet (which one can be found out by reading the first lecture of the course). We will also try not to be distracted too much by theoretical reasoning, and will strive to solve a specific problem in each of the lectures. Most of the examples are taken from a real-life system: a virtual museum of the history of computer science. The first part of the course is devoted to studying the basics of syntax and control structures. After this, client-server technology is considered as the main application area of ​​the PHP language. Then we move on to studying the most useful built-in functions in our opinion and solving practical problems with their help. Although the object model in the PHP language is not the richest, its fundamental presence allows you to naturally describe object data models. As a basic model, the document model of a virtual computer science museum will be considered. After this, a number of applied aspects will be considered: working with the file system, with the database, strings, sessions, DOM XML - all this will allow us to consider the key tasks of the practical use of the language.