pdo分页类，采用php的新数据库操作对象，封装的数据分页操作。以便统一数据库操作-pdo paging class, using the new database operations php object, package data paging operation. To a unified database operations

一个很好的页面抓取类，经过简单的修改就可以变成一个新闻小偷或搜索引擎-A good page to crawl class, through simple modifications can become a thief or a news search engine