The document contains PHP code for a website that displays and searches product information from a database. It includes:
1. Code to connect to a MySQL database and select the "banhang" database.
2. Index code that includes header, sidebar, content, and footer files. Content displays products and handles search/detail page links.
3. Product display code that queries the database and loops through results to show images, prices and links.
4. Category, search, and detail inclusion files that query the database to populate dropdowns, search results, and detailed product pages.