Pear: Introduction to the:P Ager page class

Pear's pager pagination class is a very useful PHP paging class, scalability is very strong, able to adapt to the needs of various paging situation, at least I in a few years large and small projects, basically not for paging extra code, all are used pager, It shows the pager of the availability of the strong. Here's how to use the code to see the example:

Example 1

<?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 a ordered+associative array with ' back '/' pages '/' Next '/' I '/' last '/' all ' links
NB: $links [' All '] is the same as $pager->links;
Echo links to other pages:
echo $links [' all '];
Pager can also generate <link rel= "First|prev|next|last" > 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);
?>

The use of pager, as long as you adjust the parameters of the $param array, you can cope with many kinds of paging situation. The $links array in the code contains links such as previous/page/next/First/last/all.

Example 2

Today many web sites for SEO, the dynamic page using rewrite rules forged into a static page form, such as the following. htaccess configuration:

RewriteEngine on
#Options FollowSymlinks

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

Even in this case, pager paging still has a way to work, see the following code

<?php
Require_once ' pager/pager.php ';
The pager
$params 1 = Array (
    ' Perpage '    => 3,
    ' Urlvar '     => pageid_articles,  //1st identifier
    ' ItemData '   => $someArray
);
$pager 1 = & Pager::factory ($params 1);
$data 1  = $pager 1->getpagedata ();
$links 1 = $pager 1->getlinks ();
Second Pager
$params 2 = Array (
    ' Perpage '    => 8,
    ' Urlvar '     => pageid_news,      //2nd identifier
    ' ItemData '   => $someOtherArray
);
$pager 2 = & Pager::factory ($params 2);
$data 2  = $pager 2->getpagedata ();
$links 2 = $pager 2->getlinks ();
?>

By configuring $param, you can link "/articles/march/art15.html" to the link "/article.php?num=15&month=march", more flexible performance

Extensibility

The extensibility of the Pager class, in all fairness, is also good. such as the previously written path of the paging class-Pager::P athing (), this method is extended from the Pager to meet the needs of the time.