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
PLAIN TEXT
PHP:
require_oncePager/Pager.php;
$params=array(
mode =>Jumping,
perPage =>3,
delta =>2,
itemData =>array(a,b,c,d,e,[...omissis...],z)
);
$pager= & Pager::factory($params);
$data =$pager->getPageData();
$links=$pager->getLinks();
//$links is an ordered+associative array with back/pages/next/first/last/all links
//NB: $links[all] is the same as $pager->links;

//echo links to other pages:
echo$links[all];

//Pager can also generate tags
echo$pager->linkTags;

//Show data for current page:
echoPAGED DATA: ;print_r($data);

//Results from methods:
echogetCurrentPageID()...: ;var_dump($pager->getCurrentPageID());
echogetNextPageID()......: ;var_dump($pager->getNextPageID());
echogetPreviousPageID()..: ;var_dump($pager->getPreviousPageID());
echonumItems()...........: ;var_dump($pager->numItems());
echonumPages()...........: ;var_dump($pager->numPages());
echoisFirstPage()........: ;var_dump($pager->isFirstPage());
echoisLastPage().........: ;var_dump($pager->isLastPage());
echoisLastPageComplete().: ;var_dump($pager->isLastPageComplete());
echo$pager->range........: ;var_dump($pager->range);
?>
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

PLAIN TEXT
PHP:
require_oncePager/Pager.php;

//first pager
$params1=array(
perPage =>3,
urlVar => pageID_articles, //1st identifier
itemData =>$someArray
);
$pager1= & Pager::factory($params1);
$data1 =$pager1->getPageData();
$links1=$pager1->getLinks();

//second pager
$params2=array(
perPage =>8,
urlVar => pageID_news, //2nd identifier
itemData =>$someOtherArray
);
$pager2= & Pager::factory($params2);
$data2 =$pager2->getPageData();
$links2=$pager2->getLinks();
?>
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

版权信息:可以任意转载, 转载时请务必以超链接形式标明文章原始出处和作者信息及此声明

永久链接 - http://www.ooso.net/index.php/archives/250