<?php
///////////////////////////////////////////////////////////////////
// Example where `pager` is used to page and display .jpg images in
// the "images" directory. The power of this class lies in it's
// ability to be passed to the native PHP function `foreach` as
// if it were an array. The `use_collection()` method allows you
// to select which results are iterated over, possible values
// being the class constants "pager::RESULTS" and "pager::PAGES".
///////////////////////////////////////////////////////////////////
try {
//calls and instantiates
require_once 'pager.php';
$pager = new pager();
isset($_GET['page']) or $_GET['page'] = 1; //extracts page number from query string
$images = glob('images/*.jpg'); //extracts file names into an array
//sets paging parameters
$pager->size(count($images)); //total size of collection
$pager->page_size(10); //display 10 results per page
$pager->page($_GET['page']); //sets page number, throws exception if not number
//performs paging operations,
$page_info = $pager->page_results();
//////////////////////////////////////////////////////////////////////
// array keys of array returned by `page_results()` method
// -------------------------------------------------------------------
// offset ............. zero-based offset of first item in the page
// results ............ number of results in the page
// pages .............. total number of pages
// previous ........... page number of previous page, false if none
// next ............... page number of next page, false if none
// result range ....... displays "#first - #last" i.e. "16 - 20"
// page range ......... displays "#page of #total" i.e. "2 of 4"
// mysql .............. mysql "LIMIT" clause i.e. "LIMIT 2, 10"
//////////////////////////////////////////////////////////////////////
//iterates over results, displays images
foreach ($pager as $offset) {
list($width, $height) = getimagesize($images[$offset]); //gets file' size
echo "<img src={$images["$offset"]} width=\"$width\" height=\"$height\" /><br />\n";
}
$pager->use_collection(pager::PAGES); //changes collection to "PAGES"
//sets value returned by `foreach`, "%d" is replaced by page number
$pager->return_value(' | <a href="example.php?page=%d">%d</a>');
//iterates over pages, returns page links
echo 'Go to page ';
foreach ($pager as $link) {
echo $link;
}
////////////////////////////////////////////
// Using `pager` with `count`
////////////////////////////////////////////
//counts the number of items in the page
$pager->use_collection(pager::RESULTS);
$num_results = count($pager);
//counts the total number of pages
$pager->use_collection(pager::PAGES);
$num_pages = count($pager);
echo "<p>\n".
"Results in page: $num_results<br />\n".
"Total pages: $num_pages\n".
"</p>";
} catch (Exception $e) {
echo 'The following error occurred paging the results: '.$e->getMessage();
}
?>
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