分页类系列之三

分页类之三

1. class Page {
2. private $total; //查询所有的数据总记录数
3. private $page; //当前第几页
4. private $num; //每页显示记录的条数
5. private $pageNum; //一共多少页
6. private $offset; //从数据库中取记录的开始偏移数
8. function __construct($total, $page=1, $num=5) {
9. $this->total=$total;
10. $this->page=$page;
11. $this->num=$num;
12. $this->pageNum=$this->getPageNum();
13. $this->offset=$this->getOffset();
14. }
16. private function getPageNum(){
17. return ceil($this->total/$this->num);
18. }
20. private function getNextPage() {
21. if($this->page==$this->pageNum)
22. return false;
23. else
24. return $this->page+1;
25. }
27. private function getPrevPage() {
28. if($this->page==1)
29. return false;
30. else
31. return $this->page-1;
32. }
33. //数据库查询的偏移量
34. private function getOffset() {
35. return ($this->page-1)*$this->num;
36. }
37. //当前页开始的记录数
38. private function getStartNum() {
39. if($this->total==0)
40. return 0;
41. else
42. return $this->offset+1;
43. }
44. //当前页结束的记录数
45. private function getEndNum() {
46. return min($this->offset+$this->num,$this->total);
47. }
49. public function getPageInfo(){
50. $pageInfo=array(
51. "row_total" => $this->total,
52. "row_num" => $this->num,
53. "page_num" => $this->getPageNum(),
54. "current_page" => $this->page,
55. "row_offset" => $this->getOffset(),
56. "next_page" => $this->getNextPage(),
57. "prev_page" => $this->getPrevPage(),
58. "page_start" => $this->getStartNum(),
59. "page_end" => $this->getEndNum()
60. );
61. return $pageInfo;
62. }
63. }
64. ?>

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