Php Programming Code Examples
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MySQL Paging Class
MySQL Paging Class
<?php
function findStart($limit)
{
if ((!isset($_GET['page'])) || ($_GET['page'] == "1"))
{
$start = 0;
$_GET['page'] = 1;
}
else
{
$start = ($_GET['page']-1) * $limit;
}
return $start;
}
/*
* int findPages (int count, int limit)
* Returns the number of pages needed based on a count and a limit
*/
function findPages($count, $limit)
{
$pages = (($count % $limit) == 0) ? $count / $limit : floor($count / $limit) + 1;
return $pages;
}
/*
* string pageList (int curpage, int pages)
* Returns a list of pages in the format of "� < [pages] > �"
**/
function pageList($curpage, $pages)
{
$page_list = "";
/* Print the first and previous page links if necessary */
if (($curpage != 1) && ($curpage))
{
$page_list .= " <a href=\"".$_SERVER['PHP_SELF']."?page=1\" title=\"First Page\">�</a> ";
}
if (($curpage-1) > 0)
{
$page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage-1)."\" title=\"Previous Page\"><</a> ";
}
/* Print the numeric page list; make the current page unlinked and bold */
for ($i=1; $i<=$pages; $i++)
{
if ($i == $curpage)
{
$page_list .= "<b>".$i."</b>";
}
else
{
$page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".$i."\" title=\"Page ".$i."\">".$i."</a>";
}
$page_list .= " ";
}
/* Print the Next and Last page links if necessary */
if (($curpage+1) <= $pages)
{
$page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage+1)."\" title=\"Next Page\">></a> ";
}
if (($curpage != $pages) && ($pages != 0))
{
$page_list .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".$pages."\" title=\"Last Page\">�</a> ";
}
$page_list .= "</td>\n";
return $page_list;
}
/*
* string nextPrev (int curpage, int pages)
* Returns "Previous | Next" string for individual pagination (it's a word!)
*/
function nextPrev($curpage, $pages)
{
$next_prev = "";
if (($curpage-1) <= 0)
{
$next_prev .= "Previous";
}
else
{
$next_prev .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage-1)."\">Previous</a>";
}
$next_prev .= " | ";
if (($curpage+1) > $pages)
{
$next_prev .= "Next";
}
else
{
$next_prev .= "<a href=\"".$_SERVER['PHP_SELF']."?page=".($curpage+1)."\">Next</a>";
}
return $next_prev;
}
}
?>
Example on how to use:
<?php
/* Instantiate class */
require_once("class.pager.php");
$p = new Pager;
/* Show many results per page? */
$limit = 100;
/* Find the start depending on $_GET['page'] (declared if it's null) */
$start = $p->findStart($limit);
/* Find the number of rows returned from a query; Note: Do NOT use a LIMIT clause in this query */
$count = mysql_num_rows(mysql_query("SELECT field FROM table"));
/* Find the number of pages based on $count and $limit */
$pages = $p->findPages($count, $limit);
/* Now we use the LIMIT clause to grab a range of rows */
$result = mysql_query("SELECT * FROM table LIMIT ".$start.", ".$limit);
/* Now get the page list and echo it */
$pagelist = $p->pageList($_GET['page'], $pages);
echo $pagelist;
/* Or you can use a simple "Previous | Next" listing if you don't want the numeric page listing */
//$next_prev = $p->nextPrev($_GET['page'], $pages);
//echo $next_prev;
/* From here you can do whatever you want with the data from the $result link. */
?>
