说明：  该项目是一个功能齐全的基于web的平台，旨在促进在线购买和销售。该应用程序利用PHP作为主要编程语言以及HTML、CSS和JavaScript，为客户和管理员提供无缝的用户体验。
(This project is a fully functional web-based platform designed to facilitate online buying and selling. Leveraging PHP as the primary programming language along with HTML, CSS, and JavaScript, this application provides a seamless user experience for both customers and administrators.)