1 <?php
2
3
4 class PageTool{
5 protected $total =0;
6 protected $perpage = 10;
7 protected $page = 1;
8
9
10 public function __construct($total,$perpage =false,$page=false){
11 $this->total = $total;
12 if($perpage){
13 $this->perpage = $perpage;
14 }
15
16 if($page){
17 $this->page = $page;
18 }
19 }
20 //重要的参数都已拿到，开始创建分页导航，创建分页导航两个步骤，一是保存地址栏参数，二是根据总页数和当前页数计算导航链接，先保存地址栏参数
21 public function show(){
22 $cnt = ceil($this->total/$this->perpage);
23 //分析url地址参数，去掉里面的page，
24 $url = $_SERVER['REQUERST_URI']；/*得到诸如 baidu.com?id=3&cat=5$page=99
25 //拿到带参数的地址栏后用parse_url()函数把上面路径拆成数组array(
26 [path] =>baidu.com
27 [query] =>id=3&cat=5$page=99
28 */
29 $parse = parse_url($url);
30 //判断有没有参数，也就是数组中有没有query,有了把它再拆开，用parse_str()函数
31 $param =array();
32 if(isset($parse['query'])){
33 $param = parse_str($parse['query']);/*array(
34 [id] = 3,
35 [cat]=5,
36 [page] =99
37 */
38 }
39
40 //去掉里面的page参数,不管有没有都unset下，
41 unset($param['page']);
42
43 $url = $parse['path'] . '?';
44
45 if(!empty($param)){
46 $param = http_build_query($param);//重新拼成id=3&cat=5
47 $url =$url .$param . '&'; //baidu.com?id=3&cat=5
48 }
49
50 $nav = array();
51 $nav[0] = '<span class="page_now">' . $this->page . '</span>';
52
53 for($left = $this->page-1,$right=$this->page+1;($left>=1||$right<=$cnt)&&count($nav) <= 5;) {
54
55 if($left >= 1) {
56 array_unshift($nav,'<a href="' . $url . 'page=' . $left . '">[' . $left . ']</a>');
57 $left -= 1;
58 }
59
60 if($right <= $cnt) {
61 array_push($nav,'<a href="' . $url . 'page=' . $right . '">[' . $right . ']</a>');
62 $right += 1;
63 }
64 }
65
66
67
68 return implode('',$nav);
69 }
70
71 }