PHP is a new type of CGI programming language. It is easy to learn, easy to use, and runs fast. It can quickly and easily write powerful and fast programs, and can run on Windows, Unix, and Linux platforms at the same time. Web background program has built-in functions such as file upload, password authentication, Cookies operation, email sending and receiving, dynamic GIF generation, etc. PHP directly provides original connections for many databases, including Oracle, Sybase, Postgres, Mysql, Informix, Dbase, Solid, Access, etc., fully supports the ODBC interface. When users change platforms, there is no need to change the PHP code and they can be used immediately.