PHP通用分页类page.php[仿google分页]

<?php

/**
** 通用php分页类。(仿Google样式)
** 只需提供记录总数与每页显示数两个参数。(已附详细使用说明..)
** 无需指定URL，链接由程序生成。方便用于检索结果分页。
** 表单采用GET方法提交，可保证在诸如查询之，删除之类的操作时，不丢失URL参数
**/

class Pager{
//IE地址栏地址
var $url;
//记录总条数
var $countall;
//总页数
var $page;
//分页数字链接
var $thestr;
//首页、上一页链接
var $backstr;
//尾页、下一页链接
var $nextstr;
//当前页码
var $pg;
//每页显示记录数量
var $countlist;
//翻页样式
var $style;
//构造函数，实例化该类的时候自动执行该函数
function Pager($countall,$countlist,$style="page"){
//记录数与每页显示数不能整队时，页数取余后加1
$this->countall = $countall;
$this->countlist = $countlist;
$this->style=$style;
if ($this->countall%$this->countlist!=0){
$this->page=sprintf("%d",$this->countall/$this->countlist)+1;
}else{
$this->page=$this->countall/$this->countlist;
}

$this->pg=$_GET["pg"];
//保证pg在未指定的情况下为从第1页开始
if (!ereg("^[1-9][0-9]*$",$this->pg) || empty($this->pg)){
$this->pg=1;
}
//页码超出最大范围，取最大值
if ($this->pg>$this->page){
$this->pg=$this->page;
}
//得到当前的URL。具体实现请看最底部的函数实体
$this->url = Pager::getUrl();
//替换错误格式的页码为正确页码
if(isset($_GET["pg"]) && $_GET["pg"]!=$this->pg){
$this->url=str_replace("?pg=".$_GET["pg"],"?pg=$this->pg",$this->url);
$this->url=str_replace("&pg=".$_GET["pg"],"&pg=$this->pg",$this->url);
}
//生成12345等数字形式的分页。
if ($this->page<=10){
for ($i=1;$i<$this->page+1;$i++){
$this->thestr=$this->thestr.Pager::makepg($i,$this->pg);
}
}else{
if ($this->pg<=5){
for ($i=1;$i<10;$i++){
$this->thestr=$this->thestr.Pager::makepg($i,$this->pg);
}
}else{
if (6+$this->pg<=$this->page){
for ($i=$this->pg-4;$i<$this->pg+6;$i++){
$this->thestr=$this->thestr.Pager::makepg($i,$this->pg);
}
}else{
for ($i=$this->pg-4;$i<$this->page+1;$i++){
$this->thestr=$this->thestr.Pager::makepg($i,$this->pg);
}

}
}
}
//生成上页下页等文字链接
$this->backstr = Pager::gotoback($this->pg);
$this->nextstr = Pager::gotonext($this->pg,$this->page);
//echo (" 共".$this->countall." 条,每页".$this->countlist."条，共".$this->page."页".$this->backstr.$this->thestr.$this->nextstr);
}
//生成数字分页的辅助函数
function makepg($i,$pg){
if ($i==$pg){
return " <font class='".$this->style."'>".$i."</font>";
}else{
return " <a href=".Pager::replacepg($this->url,5,$i)." class='".$this->style."'><u>".$i."</u></a>";
}
}
//生成上一页等信息的函数
function gotoback($pg){
if ($pg-1>0){
return $this->gotoback=" <a href=".Pager::replacepg($this->url,3,0)." class='".$this->style."'>首页</a> <a href=".Pager::replacepg($this->url,2,0)." class='".$this->style."'>上一页</a>";
}else{
return $this->gotoback="<span class='".$this->style."'>首页 上一页</span> ";
}
}
//生成下一页等信息的函数
function gotonext($pg,$page){
if ($pg < $page){
return " <a href=".Pager::replacepg($this->url,1,0)." class='".$this->style."'>下一页</a> <a href=".Pager::replacepg($this->url,4,0)." class='".$this->style."'>尾页</a>";
}else{
return " <span class='".$this->style."'>下一页 尾页</span>";
}
}
//处理url中$pg的方法,用于自动生成pg=x
function replacepg($url,$flag,$i){
if ($flag == 1){
$temp_pg = $this->pg;
return str_replace("pg=".$temp_pg,"pg=".($this->pg+1),$url);
}else if($flag == 2) {
$temp_pg = $this->pg;
return str_replace("pg=".$temp_pg,"pg=".($this->pg-1),$url);
}else if($flag == 3) {
$temp_pg = $this->pg;
return str_replace("pg=".$temp_pg,"pg=1",$url);
}else if($flag == 4){
$temp_pg = $this->pg;
return str_replace("pg=".$temp_pg,"pg=".$this->page,$url);
}else if($flag == 5){
$temp_pg = $this->pg;
return str_replace("pg=".$temp_pg,"pg=".$i,$url);
}else{
return $url;
}
}
//获得当前URL的方法
function getUrl(){
$url="http://".$_SERVER["HTTP_HOST"];
if(isset($_SERVER["REQUEST_URI"])){
$url.=$_SERVER["REQUEST_URI"];
}else{
$url.=$_SERVER["PHP_SELF"];
if(!empty($_SERVER["QUERY_STRING"])){
$url.="?".$_SERVER["QUERY_STRING"];
}
}
//在当前的URL里加入pg=x字样
if (!ereg("(pg=|PG=|pG=|Pg=)", $url)){
if (!strpos($url,"?")){
$url = $url."?pg=1";
}else{
$url = $url."&pg=1";
}
}
return $url;
}
}
?>