一个分页类

PHP代码:--------------------------------------------------------------------------------
CODE:
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/**********  
| +---------------------------------------------------  
| CLASS NAME: PageBar  
| +---------------------------------------------------  
| Author: Arvan [E-mail:[email protected] QQ:8817776]  
| Create date: 2003-7-17  
| Note:  
| Do for pagination  
| +---------------------------------------------------  
| Warning: no...  
| +---------------------------------------------------  
**********/  
class PageBar  
{  
var $total;  
var $onepage;  
var $num;  
var $pagecount;  
var $total_page;  
var $offset;  
var $linkhead;  
function PageBar($total, $onepage, $form_vars='')  
{  
$pagecount = $_GET['pagecount'];  
$this->total = $total;  
$this->onepage = $onepage;  
$this->total_page = ceil($total/$onepage);  
if (empty($pagecount))  
{  
$this->pagecount = 1;  
$this->offset = 0;  
}  
else  
{  
$this->pagecount = $pagecount;  
$this->offset = ($pagecount-1)*$onepage;  
}  
if (!empty($form_vars))  
{  
$vars = explode("|", $form_vars);  
$chk = $vars[0];  
$chk_value = $_POST['$chk'];  
if (empty($chk_value))  
{  
$formlink = "";  
}  
else  
{  
for ($i=0; $i++)  
{  
$var = $vars[$i];  
$value = $_POST['$var'];  
$addchar = $vars."=".$value;  
$addstr = $addstr.$addchar."&";  
}  
$formlink = "&".substr($addstr, 0, sizeof($addstr)-1);  
}  
}  
else  
{  
$formlink = "";  
}  
$linkarr = explode("pagecount=", $_SERVER['QUERY_STRING']);  
$linkft = $linkarr[0];  
if (empty($linkft))  
{  
$this->linkhead = $_SERVER['PHP_SELF']."?".$formlink;  
}  
else  
{  
$this->linkhead = $_SERVER['PHP_SELF']."?".$linkft.$formlink;  
}  
}  
#End function PageBar();  
function offset()  
{  
return $this->offset;  
}  
#End function offset();  
function pre_page($char='')  
{  
$linkhead = $this->linkhead;  
$pagecount = $this->pagecount;  
if (empty($char))  
{  
$char = "[;  
}  
if ($pagecount>1)  
{  
$pre_page = $pagecount - 1;  
return "$char";  
}  
else  
{  
return ' ';  
}  
}  
#End function pre_page();  
function next_page($char='')  
{  
$linkhead = $this->linkhead;  
$total_page = $this->total_page;  
$pagecount = $this->pagecount;  
if (empty($char))  
{  
$char = "[>]";  
}  
if ($pagecount)  
{  
$next_page = $pagecount + 1;  
return "$char";  
}  
else  
{  
return ' ';  
}  
}  
#End function next_page();  
function num_bar($num='', $color='', $left='', $right='')  
{  
$num = (empty($num))?10:$num;  
$this->num = $num;  
$mid = floor($num/2);  
$last = $num - 1;  
$pagecount = $this->pagecount;  
$totalpage = $this->total_page;  
$linkhead = $this->linkhead;  
$left = (empty($left))?"[":$left;  
$right = (empty($right))?"]":$right;  
$color = (empty($color))?"#ff0000":$color;  
$minpage = (($pagecount-$mid)$pagecount-$mid);  
$maxpage = $minpage + $last;  
if ($maxpage>$totalpage)  
{  
$maxpage = $totalpage;  
$minpage = $maxpage - $last;  
$minpage = ($minpage;  
}  
for ($i=$minpage; $i++)  
{  
$char = $left.$i.$right;  
if ($i==$pagecount)  
{  
$char = "$char";  
}  
$linkchar = "".$char."";  
$linkbar = $linkbar.$linkchar;  
}  
return $linkbar;  
}  
#End function num_bar();  
function pre_group($char='')  
{  
$pagecount = $this->pagecount;  
$linkhead = $this->linkhead;  
$num = $this->num;  
$mid = floor($num/2);  
$minpage = (($pagecount-$mid)$pagecount-$mid);  
$char = (empty($char))?"[;  
$pgpagecount = ($minpage>$num)?$minpage-$mid:1;  
return "".$char."";  
}  
#End function pre_group();  
function next_group($char='')  
{  
$pagecount = $this->pagecount;  
$linkhead = $this->linkhead;  
$totalpage = $this->total_page;  
$num = $this->num;  
$mid = floor($num/2);  
$last = $num;  
$minpage = (($pagecount-$mid)$pagecount-$mid);  
$maxpage = $minpage + $last;  
if ($maxpage>$totalpage)  
{  
$maxpage = $totalpage;  
$minpage = $maxpage - $last;  
$minpage = ($minpage;  
}  
$char = (empty($char))?"[>>]":$char;  
$ngpagecount = ($totalpage>$maxpage+$last)?$maxpage + $mid:$totalpage;  
return "".$char."";  
}  
#End function next_group();  
function whole_num_bar($num='', $color='')  
{  
$num_bar = $this->num_bar($num, $color);  
$pre_group = $this->pre_group();  
$pre_page = $this->pre_page();  
$next_page = $this->next_page();  
$next_group = $this->next_group();  
return $pre_group.$pre_page.$num_bar.$next_page.$next_group;  
}  
#End function whole_bar();  
}  
#End class PageBar;  
/*****  
//example  
$total = 1000;  
$onepage = 20;  
$pb = new PageBar($total, $onepage);  
$offset = $pb->offset();  
$pagebar = $pb->whole_num_bar();  
echo $offset."
".$pagebar;  
return:  
0  
[][>>]  
*****/  
?>