摘  要：大学校园内二手交易系统在网络上为二手的商品提供了一个类似于生活中的跳蚤市场。迄今，伴随计算机网络科技的蓬勃发展,电子商务领域得到了前所未有的飞速发展,，日渐普及的同时,成为了我们生活中的一部分，而二手交易的兴起也不可小觑。由此可见，我们的大学校园也需要一个能够为学生们提供二手商品交易的专用网站，以便发布各种商品信息。

本项目主要是设计并实现一种大学校园内二手交易系统，主要完成以下的工作：包括用户的注册、二手商品的信息发布、用户的管理等一系列功能。大学校园内二手交易系统的特色是使用了PHP语言技术。PHP语言是一种简易的动态脚本语言，具有飞快的执行速度、源码开放等特色。PHP技术还可以支持连接多种类型数据库 ，可以说是非常广泛，并且扩展库非常丰富，最重要的一点是，PHP技术有着极其高的安全性能。

对于大学校园二手交易系统，本篇文章首先从技术和经济角度上分析了可行性，与此同时，对于此系统需要的应用工具进行了完整地介绍，并且阐述了PHP在众多的技术之中的优势，也说明了二手系统的需求；紧接着在功能设计这一方面，我们对二手市场系统也是进行了详细的分析，也逐个成列了数据库中的每一个数据表；然后，就是对二手交易系统的各模块的详细功能进行了设计和描述；在文章的最后，我们会归纳出二手交易的不足之处，并做一个详尽的分析，例如在系统在代码优化方面等。

关键词：二手商品；PHP；MySQL

Abstract：The second-hand transaction system on the university campus provides a similar flea market in life for used products. So far, with the rapid development of computer network technology, the field of electronic commerce has experienced an unprecedented rapid development.. At the same time it has become increasingly popular, it has become part of our lives, and the rise of second-hand transactions cannot be underestimated. From this we can see that Our university campus also needs a website dedicated to providing secondhand goods for students. order to publish a variety of product information.

This project is mainly to design and implement a second-hand transaction The university campus system. The main task is to complete the following tasks: user registration, secondhand goods information release and user management. Second-hand trading systemcampus is characterized by the use of PHP language technology. PHP language is a simple dynamic scripting language, with features such as fast execution speed and open source code. PHP technology can also support the connection of multiple types of databases. It can be said to be very extensive, and the extension library is very rich. The most important point is that PHP technology has extremely high security performance.

For the second-hand transaction system in the university campus, this article first analyzes the feasibility from a technical and economic point of view. At the same time, it provides a complete description of the application tools needed for this system, and elaborates on PHP's many technologies. Advantages also explain the needs of second-hand systems; then, in terms of functional design, we also conducted a detailed analysis of the second-hand trading system, and also filled out each table in the database; then, it was the second-hand transaction. The detailed functions of each module of the system have been designed and described; at the end of the article, we will summarize the inadequacies of second-hand transactions and do a detailed analysis, such as the system in the code optimization and so on.

Keywords: second-hand goods; PHP; MySQL

目  录

第一章 引  言 - 2 -

1.1课题的背景、国内外研究现状、水平和发展趋势 - 3 -

1.1.1 课题的背景 - 3 -