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_once ‘Pager/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 $pager->linkTags;
//Show data for current page:
echo ‘PAGED DATA: ‘ ;print_r($data);
//Results from methods:
echo ‘getCurrentPageID()...: ‘;var_dump($pager->getCurrentPageID());
echo ‘getNextPageID()......: ‘;var_dump($pager->getNextPageID());
echo ‘getPreviousPageID()..: ‘;var_dump($pager->getPreviousPageID());
echo ‘numItems()...........: ‘;var_dump($pager->numItems());
echo ‘numPages()...........: ‘;var_dump($pager->numPages());
echo ‘isFirstPage()........: ‘;var_dump($pager->isFirstPage());
echo ‘isLastPage().........: ‘;var_dump($pager->isLastPage());
echo ‘isLastPageComplete().: ‘;var_dump($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_once ‘Pager/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