1 /**
2 *
3 * 实现思路：分页显示拆分 : 1...上页 12 13 14 15 [16] 17 18 19 20 ...100 下页
4 *
5 * function htmlPart1() : 上页
6 * function htmlPart2() : 1...
7 * function htmlPart3() : 12 13 14 15 [16] 17 18 19 20
8 * function htmlPart4() : ...100
9 * function htmlPart5() : 下页
10 *
11 * @param int $allCount 记录总数目
12 * @param int $eachPage 每页数目
13 * @param int $showCount 显示数目
14 * @param int $thenPage 当前页(页面传值)
15 * @param string $urlPrefix Url前缀
16 * @param string $urlSuffix Url后缀
17 *
18 * Author : intval@163.com
19 * Date : 2013.05.04
20 *
21 */
22 class zPage {
23
24 /** 只可内部调用 */
25 private $allCount; /** 总数(非总页数) */
26 private $eachPage; /** 每页数(分页数) */
27 private $showCount; /** 显示数(显示多少页数) */
28 private $urlPrefix; /** 页码前缀(例如：?page=) */
29 private $urlSuffix; /** 页码后缀缀(例如：&type=1) */
30 private $startHide; /** 计算前部需要出现符号(...)的最小值 */
31 private $endHide; /** 计算尾部需要出现符号(...)的最小值 */
32 private $arrTxt = array(' ', ' '); // array('上页', '上页')
33
34 /** 可外部调用 */
35 public $allPage; /** 总页数 */
36 public $thenPage; /** 当前页 */
37
38 public function __construct($allCount, $eachPage, $showCount, $thenPage, $urlPrefix = '?page=', $urlSuffix = '') {
39
40 $this->allCount = intval($allCount);
41 $this->eachPage = intval($eachPage);
42 $this->showCount = intval($showCount);
43 $this->urlPrefix = trim($urlPrefix);
44 $this->urlSuffix = trim($urlSuffix);
45
46 /** 计算总页数 */
47 $this->allPage = ceil($this->allCount / $this->eachPage);
48
49 /** 使当前页的数值合法化 */
50 $this->thenPage = max(intval($thenPage), 1);
51 $this->thenPage >= $this->allPage AND $this->thenPage = $this->allPage;
52
53 /** 计算前部和尾部需要出现符号(...)的最小值 */
54 $this->startHide = ceil($this->showCount / 2);
55 $this->endHide = $this->allPage - $this->startHide;
56 }
57
58 public function parseUrl($char = '') {
59
60 $val = $char;
61 ($char === 'prev') AND $val = $this->thenPage - 1;
62 ($char === 'next') AND $val = $this->thenPage + 1;
63 ($char === '') AND $val = $this->allPage;
64 return $this->urlPrefix . $val . $this->urlSuffix;
65 }
66
67 public function htmlPart1() {
68
69 $html = '';
70 $this->thenPage > $this->startHide AND $html = '<a class="prev" href="' . $this->parseUrl('prev') . '" title="上一页">' . $this->arrTxt[0] . '</a>' . PHP_EOL;
71 return $html;
72 }
73
74 public function htmlPart2() {
75
76 $dot = '';
77 $this->thenPage > $this->startHide AND $dot = ' ...';
78
79 $html = '<a href="' . $this->parseUrl(1) . '">1'. $dot .'</a>' . PHP_EOL;
80 $this->thenPage == 1 AND $html = '<span>1</span>' . PHP_EOL;
81
82 return $html;
83 }
84
85 public function htmlPart3() {
86
87 $html = '';
88
89 if ($this->thenPage <= $this->startHide) {
90
91 /**
92 * 第一种情况：[1] 2 3 4 5 6 7 8 9 10 ...100 下页
93 * 即：当前部在 不需要出现...的 范围之内
94 */
95 for ($i = 2, $n = $this->showCount; $i < $n; $i++) {
96 $html .= (($i == $this->thenPage) ? '<span>' . $this->thenPage . '</span>' : '<a href="' . $this->parseUrl($i) . '">' . $i . '</a>') . PHP_EOL;
97 }
98
99 } elseif ($this->thenPage >= $this->endHide) {
100
101 /**
102 * 第二种情况：上页 1..92 93 94 95 96 97 98 [99] 100
103 * 即：当尾部在 不需要出现...的 范围之内
104 */
105 $len = $this->showCount - 2;
106 $i = $this->allPage - $len;
107 $n = $this->allPage;
108 for ($i; $i < $n; $i++) {
109 $html .= (($i == $this->thenPage) ? '<span>' . $this->thenPage . '</span>' : '<a href="' . $this->parseUrl($i) . '">' . $i . '</a>') . PHP_EOL;
110 }
111
112 } else {
113
114 /**
115 * 第三种情况：上页 1..12 13 14 15 [16] 17 18 19 20 ...100 下页
116 * 即：当前后都在 需要出现...的 范围之内
117 */
118 $len = $this->showCount - 2; // 此处减去2，是说明头尾各占去一个数字(1, x)
119 $offset = ceil($len / 2) - 1; // 对剩下的数目平分，得出平分数
120 $i = $this->thenPage - $offset; // 循环开始：当前页向前偏移平分数
121 $n = $this->thenPage + $offset; // 循环结束：当前页向后偏移平分数
122 for ($i; $i <= $n; $i++) {
123 $html .= (($i == $this->thenPage) ? '<span>' . $this->thenPage . '</span>' : '<a href="' . $this->parseUrl($i) . '">' . $i . '</a>') . PHP_EOL;
124 }
125 }
126
127 return $html;
128 }
129
130 public function htmlPart4() {
131
132 $dot = '';
133 $this->thenPage < $this->endHide AND $dot = '... ';
134
135 $html = '<a href="' . $this->parseUrl() . '">' . $dot . $this->allPage . '</a>' . PHP_EOL;
136 $this->thenPage == $this->allPage AND $html = '<span>' . $this->allPage . '</span>' . PHP_EOL;
137
138 return $html;
139 }
140
141 public function htmlPart5() {
142
143 $html = '';
144 $this->thenPage < $this->endHide AND $html = '<a class="next" href="' . $this->parseUrl('next') . '" title="下一页">' . $this->arrTxt[1] . '</a>' . PHP_EOL;
145 return $html;
146 }
147
148 public function html() {
149
150 $pageHtml = '';
151
152 /** 总页数未达到显示页码数，则全部显示 */
153 if ($this->allPage <= $this->showCount) {
154 for ($i = 1; $i <= $this->allPage; $i++) {
155 $pageHtml .= ($i == $this->thenPage) ? '<span>' . $this->thenPage . '</span>' . PHP_EOL : '<a href="' . $this->parseUrl($i) . '">' . $i . '</a>' . PHP_EOL;
156 }
157 } else {
158 $pageHtml = $this->htmlPart2() . $this->htmlPart1() . $this->htmlPart3() . $this->htmlPart4() . $this->htmlPart5();
159 }
160
161 return $pageHtml;
162 }
163 }
164
165 // 调用例子
166 $getPage = isset($_GET['page']) ? intval($_GET['page']) : 0;
167 $getPage = max($getPage, 1);
168 $zPage = new zPage(1100, 10, 11, $getPage, '?page=', '&type=1');
169 echo $zPage->html();
