A class that makes paging (previous and next links) through MySQL results easy.
By : Jesse
<?php /************************************************************************************** * Class: Pager * Author: Tsigo <tsigo@tsiris.com> * Methods: * findStart * findPages * pageList * nextPrev * Redistribute as you see fit. **************************************************************************************/ class Pager { /*********************************************************************************** * int findStart (int limit) * Returns the start offset based on $_GET['page'] and $limit ***********************************************************************************/ function findStart($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> "; }
/* 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> "; }
<?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. */ ?>
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