Pear::Pager分页类简介--空空的世界

Pear::Pager分页类简介

Pear的Pager分页类是一个很好用的php分页类,扩展性很强,能够适应各种分页情况的需求,至少我在几年间大大小小的项目里,基本上没有为分页额外写过代码,全部都是用的Pager,足见Pager的可用性之强.下面用代码来看看它的使用范例:

例子1

1. require_once 'Pager/Pager.php';
2. $params = array(
3.     'mode'       => 'Jumping',
4.     'perPage'    => 3,
5.     'delta'      => 2,
6.     'itemData'   => array('a','b','c','d','e',[...omissis...],'z')
7. );
8. $pager = & Pager::factory($params);
9. $data  = $pager->getPageData();
10. $links = $pager->getLinks();
11. //$links is an ordered+associative array with 'back'/'pages'/'next'/'first'/'last'/'all' links
12. //NB: $links['all'] is the same as $pager->links;
13.  
14. //echo links to other pages:
15. echo $links['all'];
16.  
17. //Pager can also generate tags
18. echo $pager->linkTags;
19.  
20. //Show data for current page:
21. echo 'PAGED DATA: ' ; print_r($data);
22.  
23. //Results from methods:
24. echo 'getCurrentPageID()...: '; var_dump($pager->getCurrentPageID());
25. echo 'getNextPageID()......: '; var_dump($pager->getNextPageID());
26. echo 'getPreviousPageID()..: '; var_dump($pager->getPreviousPageID());
27. echo 'numItems()...........: '; var_dump($pager->numItems());
28. echo 'numPages()...........: '; var_dump($pager->numPages());
29. echo 'isFirstPage()........: '; var_dump($pager->isFirstPage());
30. echo 'isLastPage().........: '; var_dump($pager->isLastPage());
31. echo 'isLastPageComplete().: '; var_dump($pager->isLastPageComplete());
32. echo '$pager->range........: '; var_dump($pager->range);
33. ?>

Pager的使用,只要调整$param数组的参数,就可以应付很多种分页情况了.代码中的$links数组包含了一些链接,如上一页/页码/下一页/第一页/末页/全部.

例2

如今许多网站为了SEO,把动态页使用rewrite规则伪造成静态页的形式,例如下面这个.htaccess配置:

RewriteEngine on
#Options FollowSymlinks

RewriteBase /
RewriteRule ^articles/([a-z]{1,12})/art([0-9]{1,4})\.html$ /article.php?num=$2&month=$1 [L]

即使在这种情况下,Pager分页仍然有办法工作,见下面的code

1. require_once 'Pager/Pager.php';
2.  
3. //first pager
4. $params1 = array(
5.     'perPage'    => 3,
6.     'urlVar'     => pageID_articles,  //1st identifier
7.     'itemData'   => $someArray
8. );
9. $pager1 = & Pager::factory($params1);
10. $data1  = $pager1->getPageData();
11. $links1 = $pager1->getLinks();
12.  
13. //second pager
14. $params2 = array(
15.     'perPage'    => 8,
16.     'urlVar'     => pageID_news,      //2nd identifier
17.     'itemData'   => $someOtherArray
18. );
19. $pager2 = & Pager::factory($params2);
20. $data2  = $pager2->getPageData();
21. $links2 = $pager2->getLinks();
22. ?>

通过配置$param,就能够把链接 "/articles/march/art15.html"对应到链接"/article.php?num=15&month=march" ,比较灵活的表现