说明：  分页代码是PHP学习中基本也是PHP学习必学的内容，分页功能分离出来做为参考或者使用，可用于伪静态、静态和动态分页，兼容各常用浏览器。
(The paging code is the basic content in PHP learning and is also a must for PHP learning. The paging function is separated for reference or use. It can be used for pseudo-static, static and dynamic paging, and is compatible with all common browsers.)