分页类之三 class Page { private $total; //查询所有的数据总记录数 private $page; //当前第几页 private $num; //每页显示记录的条数 private $pageNum; //一共多少页 private $offset; //从数据库中取记录的开始偏移数 function __construct($total, $page=1, $num=5) { $this->total=$total; $this->page=$page; $this->num=$num; $this->pageNum=$this->getPageNum(); $this->offset=$this->getOffset(); } private function getPageNum(){ return ceil($this->total/$this->num); } private function getNextPage() { if($this->page==$this->pageNum) return false; else return $this->page+1; } private function getPrevPage() { if($this->page==1) return false; else return $this->page-1; } //数据库查询的偏移量 private function getOffset() { return ($this->page-1)*$this->num; } //当前页开始的记录数 private function getStartNum() { if($this->total==0) return 0; else return $this->offset+1; } //当前页结束的记录数 private function getEndNum() { return min($this->offset+$this->num,$this->total); } public function getPageInfo(){ $pageInfo=array( "row_total" => $this->total, "row_num" => $this->num, "page_num" => $this->getPageNum(), "current_page" => $this->page, "row_offset" => $this->getOffset(), "next_page" => $this->getNextPage(), "prev_page" => $this->getPrevPage(), "page_start" => $this->getStartNum(), "page_end" => $this->getEndNum() ); return $pageInfo; } } ?> 复制代码