之前看过几个分页类代码都比较长和复杂，愧于自己水平低下，没能看懂那些代码，加上发现当要在复合条件查询并分页显示数据的时候，那就很不好用了，于是想自己写一个。使用PHP五个月，对于类的概念和使用也才刚刚似懂非懂，这是本人第一次写的类——分页导航类，希望对新手，还有像我这样的PHPer有帮助！！
/*
_________________________________
CLASS NAME:SHOWPAGE
_________________________________
Copyright(c): ERLDY(稻草人)
Author: Arvan [E-mail:erldy@126.com QQ:103808353]
Create date: 2004-09-27
________________________________
*/
/*****
实例：
$sql = "select count(*)as count from $tbl";
$db->query($sql);
$db->next_record();
$count = $db->f(count);//记录总数
$page = new ShowPage;
$page->PageSize = 20;
$page->Total = $count;
$page->LinkAry = array(); //使用array("id"=>$id)这样的数组传递url变量
$sql = "select * from $tbl order by sortid desc limit ".$page->OffSet();
$db->query($sql);
$showpage = $page->ShowLink();
*****/
class ShowPage {
var $PageSize; //每页显示的记录数
var $Total; //记录总数
var $LinkAry; //Url参数数组，对于复合条件查询分页显示情况非常好用
//取得总页数
function PageCount() {
$TotalPage = ($this->Total % $this->PageSize == 0) ? floor($this->Total / $this->PageSize) : floor($this->Total / $this->PageSize)+1;
return $TotalPage;
}
//取得当前页
function PageNum() {
$page = (isset( $_GET['page'])!="") ? $_GET['page'] : $page = 1;
return $page;
}
//查询语句定位指针
function OffSet() {
if ($this->PageNum() > $this->PageCount()) {
//$this->PageNum = $this->PageCount();
$pagemin = max(0,$this->Total - $this->PageSize - 1);
}else if ($this->PageNum() == 1){
$pagemin = 0;
}else {
$pagemin = min($this->Total - 1,$this->PageSize * ($this->PageNum() - 1));
}
return $pagemin . "," . $this->PageSize;
}
//定位首页
function FristPage() {
$Frist = ($this->PageNum() <= 1) ? "首页 " : "<a href=\"?page=1".$this->Url($this->LinkAry)."\">首页</a> ";
return $Frist;
}
//定位上一页
function PrePage() {
$prepage=$this->PageNum() - 1;
$Previous = ($this->PageNum() >= 2) ? " <a href=\"?page=".$prepage.$this->Url($this->LinkAry)."\">上一页</a> " : "上一页 ";
return $Previous;
}
//定位下一页
function NextPage() {
$nextpage = $this->PageNum() + 1;
$Next = ($this->PageNum() <= $this->PageCount()-1) ? " <a href=\"?page=".$nextpage.$this->Url($this->LinkAry)."\">下一页</a> " : "下一页 ";
return $Next;
}
//定位最后一页
function LastPage() {
$Last = ($this->PageNum() >= $this->PageCount()) ? "尾页 " : " <a href=\"?page=".$this->PageCount().$this->Url($this->LinkAry)."\">尾页</a> ";
return $Last;
}
//下拉跳转页面
function JumpPage() {
$Jump = " 当前第 <b>".$this->PageNum()."</b> 页 共 <b>".$this->PageCount()."</b> 页 跳到 <select name=page onchange=\"javascript:location=this.options[this.selectedIndex].value;\">";
for ($i=1; $i<=$this->PageCount(); $i++) {
if ($i==$this->PageNum())
$Jump .= "<option value=\"?page=".$i.$this->Url($this->LinkAry)."\" selected>$i</option>";
else
$Jump .="<option value=\"?page=".$i.$this->Url($this->LinkAry)."\">$i</option> ";
}
$Jump .= "</select> 页 <b>[".$this->PageSize."条/页]</b>";
return $Jump;
}
//URL参数处理
function Url($ary) {
$Linkstr = "";
if (count($ary) > 0) {
foreach ($ary as $key => $val) {
$Linkstr .= "&".$key."=".$val;
}
}
return $Linkstr;
}
//生成导航条
function ShowLink() {
return $this->FristPage().$this->PrePage().$this->NextPage().$this->LastPage().$this->JumpPage();
}
}
这个类实现了分页的一般但比较全的功能，自我感觉结构非常简单，代码也很容易看懂，并且也比较好用！！
