php分页类

<?php
/******************************************************
*版权： 高西林
*文件名：class.PageBar.php
*作者：高西林
*日期：2007-07-27
*描述：
生成分页导航栏。
*修改记录：
修改人 日期 记录
高西林 2007-07-30 修正页数为0时，引发的错误！
增加countpgs来统一计算页数。
高西林 2007-07-30 修正风格2，3，4页码后退时看部到
当前页码前一个页码的缺陷。
******************************************************/
class PageBar{
public $pageindex = 1; //当前页码。
public $total = 1; //总记录数。
public $perpage = 10; //每页显示条数。
public $joinword = '?'; //页码导航与原url地址连接词。
public $pageindexword = 'pageindex'; //页码url变量名
public $navigateurl = ''; //原url地址。
public $pagebarstyle = 1; //导航栏的风格。
public $pagenoperpage = 5; //显示页码的数量，只对风格2、3、4起作用。
///
public function __construct(){
}
public function __destruct(){
}
///生成分页导航条
public function createPageBar(){
switch($this -> pagebarstyle){
case 1:
return $this -> style1PageBar();
case 2:
return $this -> style2PageBar();
case 3:
return $this -> style3PageBar();
case 4:
return $this -> style4PageBar();
case 5:
return $this -> style5PageBar();
default:
return $this -> style1PageBar();
}
}
///
/**
生成导航风格1：
显示第1-10条记录 共98条记录
首页 前页 后页 尾页 到第 1 页，共10页
*/
private function style1PageBar(){
$totalpage = $this -> countpgs($this -> total , $this -> perpage);
if($totalpage == 0)return;

//
$beginnum = ($totalpage-1) * $this -> perpage + 1;//本页中第一条记录号
$endnum = $totalpage * $this -> perpage; //本页中最后一条记录号

$navigateprefix = $this -> navigateurl . $this -> joinword . $this -> pageindexword . "=";

$firstpageurl = $navigateprefix."1";
$lastpageurl = $navigateprefix . $totalpage;
$prepageurl = $this -> pageindex > 1 ? "href=/"" . $navigateprefix . ($this -> pageindex -1) . "/"" : '';
$nextpageurl = $this -> pageindex < $totalpage ? "href=/"" . $navigateprefix . ($this -> pageindex +1) . "/"" : '';

//
$navigatebar = "显示第" . $beginnum . "-".$endnum . "条记录    
共" . $this -> total . "条记录<br />";

$navigatebar .= "<a href=/"$firstpageurl/">首页</a>  ";
$navigatebar .= "<a $prepageurl>前页</a>  ";
$navigatebar .= "<a $nextpageurl > 后页</a>  ";
$navigatebar .= "<a href=/"$lastpageurl/" >尾页</a>  ";

$navigatebar .= "到第<select name=/"select/" onchange='window.location=/"$url" .
$this -> joinword . $this -> pageindexword . "=/"+this.value'>";

for($i = 1 ; $i <= $totalpage ; $i++){
if($i == $this -> pageindex){
$navigatebar .= "<option value=/"$i/" selected=/"selected/">$i</option>";
}else $navigatebar .= "<option value=/"$i/">$i</option>";
}
$navigatebar .= " </select>页，共10页";

return $navigatebar;
}

/**
生成导航风格1：
< | 1 | 2 | 3 | 4 | 5 | 6 | 7 | >
*/
private function style2PageBar(){
$totalpage = $this -> countpgs($this -> total , $this -> perpage);
if($totalpage == 0)return;

//
$navigateprefix = $this -> navigateurl . $this -> joinword . $this -> pageindexword . "=";

$prepageurl = $this -> pageindex > 1 ? "href=/"" . $navigateprefix . ($this -> pageindex -1) . "/"" : '';
$nextpageurl = $this -> pageindex < $totalpage ? "href=/"" . $navigateprefix . ($this -> pageindex +1) . "/"" : '';

//
$navigatebar .= "<a $prepageurl><</a> | ";

$ii = $this -> startPage($totalpage);
for($i = 0; $i < $this -> pagenoperpage && $i + $ii <= $totalpage ; $i++){
$pageurl = "href=/"" . $navigateprefix . ($i + $ii) . "/"";
if($i + $ii == $this -> pageindex)$pageurl = '';
$navigatebar .= "<a $pageurl>" . ($i + $ii) . "</a> | ";
}
$navigatebar .= "<a $nextpageurl >></a>";
return $navigatebar;
}

/**
生成导航风格1：
上一页 [1] [2] [3] [4] [4] [5] [6] [7] [8] [9] 下一页
*/

private function style3PageBar(){
$totalpage = $this -> countpgs($this -> total , $this -> perpage);
if($totalpage == 0)return;

//
$navigateprefix = $this -> navigateurl . $this -> joinword . $this -> pageindexword . "=";

$prepageurl = $this -> pageindex > 1 ? "href=/"" . $navigateprefix . ($this -> pageindex -1) . "/"" : '';
$nextpageurl = $this -> pageindex < $totalpage ? "href=/"" . $navigateprefix . ($this -> pageindex +1) . "/"" : '';

//
$navigatebar .= "<a $prepageurl>上一页</a> ";

$ii = $this -> startPage($totalpage);
for($i = 0; $i < $this -> pagenoperpage && $i + $ii <= $totalpage ; $i++){
$pageurl = "href=/"" . $navigateprefix . ($i + $ii) . "/"";
if($i + $ii == $this -> pageindex)$pageurl = '';
$navigatebar .= "[<a $pageurl>" . ($i + $ii) . "</a>] ";
}
$navigatebar .= "<a $nextpageurl >下一页</a>";
return $navigatebar;
}

/**
生成导航风格1：
[<<] [<] [1] [2] [3] [4] [5] [6] [>] [>>]
*/
private function style4PageBar(){
$totalpage = $this -> countpgs($this -> total , $this -> perpage);
if($totalpage == 0)return;

//
$navigateprefix = $this -> navigateurl . $this -> joinword . $this -> pageindexword . "=";

$firstpageurl = $navigateprefix."1";
$lastpageurl = $navigateprefix . $totalpage;
$prepageurl = $this -> pageindex > 1 ? "href=/"" . $navigateprefix . ($this -> pageindex -1) . "/"" : '';
$nextpageurl = $this -> pageindex < $totalpage ? "href=/"" . $navigateprefix . ($this -> pageindex +1) . "/"" : '';

//
$navigatebar .= "[<a href=/"$firstpageurl/"><<</a>]  ";
$navigatebar .= "[<a $prepageurl><</a>] ";

$ii = $this -> startPage($totalpage);
for($i = 0; $i < $this -> pagenoperpage && $i + $ii <= $totalpage ; $i++){
$pageurl = "href=/"" . $navigateprefix . ($i + $ii) . "/"";
if($i + $ii == $this -> pageindex)$pageurl = '';
$navigatebar .= "[<a $pageurl>" . ($i + $ii) . "</a>] ";
}
$navigatebar .= "[<a $nextpageurl >></a>]";
$navigatebar .= "[<a href=/"$lastpageurl/" >>></a>] ";
return $navigatebar;
}

/**
生成导航风格1：
当前显示第1页, 每页10条|共13条 [首页] [前页] [后页] [尾页] 跳转到 1 页 ,共10页
*/
private function style5PageBar(){
$totalpage = $this -> countpgs($this -> total , $this -> perpage);
if($totalpage == 0)return;

//
$beginnum = ($totalpage-1) * $this -> perpage + 1;//本页中第一条记录号
$endnum = $totalpage * $this -> perpage; //本页中最后一条记录号

$navigateprefix = $this -> navigateurl . $this -> joinword . $this -> pageindexword . "=";

$firstpageurl = $navigateprefix."1";
$lastpageurl = $navigateprefix . $totalpage;
$prepageurl = $this -> pageindex > 1 ? "href=/"" . $navigateprefix . ($this -> pageindex -1) . "/"" : '';
$nextpageurl = $this -> pageindex < $totalpage ? "href=/"" . $navigateprefix . ($this -> pageindex +1) . "/"" : '';

//
$navigatebar = "当前显示第" . $this -> pageindex . "页, 每页" .
$this -> perpage . "条|共" . $this -> total . "条 ";
$navigatebar .= "[<a href=/"$firstpageurl/">首页</a>] ";
$navigatebar .= "[<a $prepageurl>前页</a>] ";
$navigatebar .= "[<a $nextpageurl>后页</a>] ";
$navigatebar .= "[<a href=/"$lastpageurl/" >尾页</a>] ";
$navigatebar .= "跳转到<select name=/"select/" onchange='window.location=/"$url" .
$this -> joinword . $this -> pageindexword . "=/"+this.value'>";

for($i = 1 ; $i <= $totalpage ; $i++){
if($i == $this -> pageindex){
$navigatebar .= "<option value=/"$i/" selected=/"selected/">$i</option>";
}else $navigatebar .= "<option value=/"$i/">$i</option>";
}
$navigatebar .= " </select>页，共" .$totalpage . "页";

return $navigatebar;

}

//
private function countpgs($total , $perpage){
$this -> perpage = $this -> perpage <= 0 ? 1 : $this -> perpage;
return ceil($this -> total / $this -> perpage);
}

//只对风格2,3,4起作用
private function startPage($totalpage){
$ii = $totalpage - $this -> pageindex;
$ii = $ii+1 >= $this -> pagenoperpage ? $this -> pageindex : $this -> pageindex - ($this ->pagenoperpage - ($ii + 1));
$ii = $ii > 0 ? $ii : 1;
if($ii == $this -> pageindex && $ii > 1)$ii -= 1;
return $ii;
}
}
?>