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
PHP:
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<?php
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require_once 'Pager/Pager.php';
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$params = array(
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'mode' => 'Jumping',
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'perPage' => 3,
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'delta' => 2,
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'itemData' => array('a','b','c','d','e',[...omissis...],'z')
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);
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$pager = & Pager::factory($params);
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$data = $pager->getPageData();
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$links = $pager->getLinks();
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//$links is an ordered+associative array with 'back'/'pages'/'next'/'first'/'last'/'all' links
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//NB: $links['all'] is the same as $pager->links;
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//echo links to other pages:
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echo $links['all'];
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//Pager can also generate <link rel="first|prev|next|last"> tags
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echo $pager->linkTags;
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//Show data for current page:
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echo 'PAGED DATA: ' ; print_r($data);
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//Results from methods:
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echo 'getCurrentPageID()...: '; var_dump($pager->getCurrentPageID());
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echo 'getNextPageID()......: '; var_dump($pager->getNextPageID());
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echo 'getPreviousPageID()..: '; var_dump($pager->getPreviousPageID());
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echo 'numItems()...........: '; var_dump($pager->numItems());
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echo 'numPages()...........: '; var_dump($pager->numPages());
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echo 'isFirstPage()........: '; var_dump($pager->isFirstPage());
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echo 'isLastPage().........: '; var_dump($pager->isLastPage());
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echo 'isLastPageComplete().: '; var_dump($pager->isLastPageComplete());
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echo '$pager->range........: '; var_dump($pager->range);
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?>
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=$1 [L]
即使在这种情况下,Pager分页仍然有办法工作,见下面的code
PHP:
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<?php
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require_once 'Pager/Pager.php';
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//first pager
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$params1 = array(
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'perPage' => 3,
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'urlVar' => pageID_articles, //1st identifier
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'itemData' => $someArray
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);
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$pager1 = & Pager::factory($params1);
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$data1 = $pager1->getPageData();
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$links1 = $pager1->getLinks();
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//second pager
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$params2 = array(
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'perPage' => 8,
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'urlVar' => pageID_news, //2nd identifier
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'itemData' => $someOtherArray
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);
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$pager2 = & Pager::factory($params2);
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$data2 = $pager2->getPageData();
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$links2 = $pager2->getLinks();
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?>
通过配置$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
扩展性
Pager类的扩展性,平心而论,也是不错的.比如以前写的path方式的分页类 - Pager::Pathing(),这个方法就是从Pager上扩展而来,满足了当时的需求.
作者: volcano 发表于9月 22, 2006 at 7:16 am
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