一个不错的php分页类的代码

4. /**
5. * filename: ext_page.class.php
6. * @package:phpbean
7. * @author :feifengxlq
8. * @copyright :Copyright 2006 feifengxlq
9. * @license:version 2.0
10. * description: 分页类，四种分页模式
11. * 2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
12. * to see detail,please visit http://www.phpobject.net/blog/read.php?
13. * example:
14. * 模式四种分页模式：
15. require_once('../libs/classes/page.class.php');
16. $page=new page(array('total'=>1000,'perpage'=>20));
17. echo 'mode:1
    '.$page->show();
18. echo '

    ---

    mode:2
    '.$page->show(2);
19. echo '

    ---

    mode:3
    '.$page->show(3);
20. echo '

    ---

    mode:4
    '.$page->show(4);
21. 开启AJAX：
22. $ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
23. echo 'mode:1
    '.$ajaxpage->show();
24. 采用继承自定义分页显示模式：
25. demo:http://www.phpobject.net/blog
26. */
27. class page
28. {
29. /**
30. * config ,public
31. */
32. var $page_name="PB_page";//page标签，用来控制url页
33. var $next_page='>';//下一页
34. var $pre_page='var $first_page='First';//首页
35. var $last_page='Last';//尾页
36. var $pre_bar='var $next_bar='>>';//下一分页条
37. var $format_left='[';
38. var $format_right=']';
39. var $is_ajax=false;//是否支持AJAX分页模式

40. /**

41. * private
42. *
43. */
44. var $pagebarnum=10;//控制记录条的个数。
45. var $totalpage=0;//总页数
46. var $ajax_action_name='';//AJAX动作名
47. var $nowindex=1;//当前页
48. var $url="";//url地址头
49. var $offset=0;

50. /**

51. * constructor构造函数
52. *
53. * @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']
54. */
55. function page($array)
56. {
57. if(is_array($array)){
58. if(!array_key_exists('total',$array))$this->error(__FUNCTION__,'need a param of total');
59. $total=intval($array['total']);
60. $perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;
61. $nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';
62. $url=(array_key_exists('url',$array))?$array['url']:'';
63. }else{
64. $total=$array;
65. $perpage=10;
66. $nowindex='';
67. $url='';
68. }
69. if((!is_int($total))||($totalerror(__FUNCTION__,$total.' is not a positive integer!');
70. if((!is_int($perpage))||($perpageerror(__FUNCTION__,$perpage.' is not a positive integer!');
71. if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);//设置pagename
72. $this->_set_nowindex($nowindex);//设置当前页
73. $this->_set_url($url);//设置链接地址
74. $this->totalpage=ceil($total/$perpage);
75. $this->offset=($this->nowindex-1)*$perpage;
76. if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
77. }
78. /**
79. * 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
80. *
81. * @param string $var
82. * @param string $value
83. */
84. function set($var,$value)
85. {
86. if(in_array($var,get_object_vars($this)))
87. $this->$var=$value;
88. else {
89. $this->error(__FUNCTION__,$var." does not belong to PB_Page!");
90. }

91. }

92. /**
93. * 打开倒AJAX模式
94. *
95. * @param string $action 默认ajax触发的动作。
96. */
97. function open_ajax($action)
98. {
99. $this->is_ajax=true;
100. $this->ajax_action_name=$action;
101. }
102. /**
103. * 获取显示"下一页"的代码
104. *
105. * @param string $style
106. * @return string
107. */
108. function next_page($style='')
109. {
110. if($this->nowindextotalpage){
111. return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
112. }
113. return ''.$this->next_page.'';
114. }

115. /**

116. * 获取显示“上一页”的代码
117. *
118. * @param string $style
119. * @return string
120. */
121. function pre_page($style='')
122. {
123. if($this->nowindex>1){
124. return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
125. }
126. return ''.$this->pre_page.'';
127. }

128. /**

129. * 获取显示“首页”的代码
130. *
131. * @return string
132. */
133. function first_page($style='')
134. {
135. if($this->nowindex==1){
136. return ''.$this->first_page.'';
137. }
138. return $this->_get_link($this->_get_url(1),$this->first_page,$style);
139. }

140. /**

141. * 获取显示“尾页”的代码
142. *
143. * @return string
144. */
145. function last_page($style='')
146. {
147. if($this->nowindex==$this->totalpage){
148. return ''.$this->last_page.'';
149. }
150. return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);
151. }

152. function nowbar($style='',$nowindex_style='')

153. {
154. $plus=ceil($this->pagebarnum/2);
155. if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);
156. $begin=$this->nowindex-$plus+1;
157. $begin=($begin>=1)?$begin:1;
158. $return='';
159. for($i=$begin;$ipagebarnum;$i++)
160. {
161. if($itotalpage){
162. if($i!=$this->nowindex)
163. $return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style));
164. else
165. $return.=$this->_get_text(''.$i.'');
166. }else{
167. break;
168. }
169. $return.="\n";
170. }
171. unset($begin);
172. return $return;
173. }
174. /**
175. * 获取显示跳转按钮的代码
176. *
177. * @return string
178. */
179. function select()
180. {
181. $return='';
     for($i=1;$itotalpage;$i++)
     {
     if($i==$this->nowindex){
     $return.='
     '.$i.'';
     }else{
     $return.='
     '.$i.'';
     }
     }
     unset($i);
     $return.='
     ';
182. return $return;
183. }

184. /**

185. * 获取mysql 语句中limit需要的值
186. *
187. * @return string
188. */
189. function offset()
190. {
191. return $this->offset;
192. }

193. /**

194. * 控制分页显示风格
195. *
196. * @param int $mode
197. * @return string
198. */
199. function show($mode=1)
200. {
201. switch ($mode)
202. {
203. case '1':
204. $this->next_page='下一页';
205. $this->pre_page='上一页';
206. return $this->pre_page().$this->nowbar().$this->next_page().'第'.$this->select().'页';
207. break;
208. case '2':
209. $this->next_page='下一页';
210. $this->pre_page='上一页';
211. $this->first_page='首页';
212. $this->last_page='尾页';
213. return $this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';
214. break;
215. case '3':
216. $this->next_page='下一页';
217. $this->pre_page='上一页';
218. $this->first_page='首页';
219. $this->last_page='尾页';
220. return $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
221. break;
222. case '4':
223. $this->next_page='下一页';
224. $this->pre_page='上一页';
225. return $this->pre_page().$this->nowbar().$this->next_page();
226. break;
227. case '5':
228. return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();
229. break;
230. }

231. }

232. /*------private function (私有方法)---------*/
233. /** @link：http://bbs.it-home.org
234. * 设置url头地址
235. * @param: String $url
236. * @return boolean
237. */
238. function _set_url($url="")
239. {
240. if(!empty($url)){
241. //手动设置
242. $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
243. }else{
244. //自动获取
245. if(empty($_SERVER['QUERY_STRING'])){
246. //不存在QUERY_STRING时
247. $this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
248. }else{
249. //
250. if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
251. //地址存在页面参数
252. $this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_SERVER['REQUEST_URI']);
253. $last=$this->url[strlen($this->url)-1];
254. if($last=='?'||$last=='&'){
255. $this->url.=$this->page_name."=";
256. }else{
257. $this->url.='&'.$this->page_name."=";
258. }
259. }else{
260. //
261. $this->url=$_SERVER['REQUEST_URI'].'&'.$this->page_name.'=';
262. }//end if
263. }//end if
264. }//end if
265. }

266. /**

267. * 设置当前页面
268. *
269. */
270. function _set_nowindex($nowindex)
271. {
272. if(empty($nowindex)){
273. //系统获取

274. if(isset($_GET[$this->page_name])){

275. $this->nowindex=intval($_GET[$this->page_name]);
276. }
277. }else{
278. //手动设置
279. $this->nowindex=intval($nowindex);
280. }
281. }

282. /**

283. * 为指定的页面返回地址值
284. *
285. * @param int $pageno
286. * @return string $url
287. */
288. function _get_url($pageno=1)
289. {
290. return $this->url.$pageno;
291. }

292. /**

293. * 获取分页显示文字，比如说默认情况下_get_text('1')将返回[1]
294. *
295. * @param String $str
296. * @return string $url
297. */
298. function _get_text($str)
299. {
300. return $this->format_left.$str.$this->format_right;
301. }

302. /**

303. * 获取链接地址
304. */
305. function _get_link($url,$text,$style=''){
306. $style=(empty($style))?'':'class="'.$style.'"';
307. if($this->is_ajax){
308. //如果是使用AJAX模式
309. return ''.$text.'';
310. }else{
311. return ''.$text.'';
312. }
313. }
314. /**
315. * 出错处理方式
316. */
317. function error($function,$errormsg)
318. {
319. die('Error in file '.__FILE__.' ,Function '.$function.'() :'.$errormsg);
320. }
321. }
322. $page=new page(array('total'=>1000,'perpage'=>20));
323. echo 'mode:1
     '.$page->show();
324. echo '

     ---

     mode:2
     '.$page->show(2);
325. echo '

     ---

     mode:3
     '.$page->show(3);
326. echo '

     ---

     mode:4
     '.$page->show(4);
327. echo '

     ---

     开始AJAX模式:';
328. $ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
329. echo 'mode:1
     '.$ajaxpage->show();
330. ?>

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