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分页类系列之三

时间：2021-07-01 10:21:17 帮助过：20人阅读

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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