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; 
} 
} 
?>