一个浅显易懂的分页类_function currentpage()-优快云博客

<?php
class page{
类功能：分页
创建时间：2005-03-12
作者：多菜鸟
EMAIL：kingerq AT msn.com
来源：http://blog.youkuaiyun.com/kingerq

实例：
//省略一些连接信息及mysql类库等包含文件
$sql = "select count(*) from t_publiccode";
$db->query($sql);
$db->next_record();
$recordcount = $db->f(0);//记录总数

$p = new page($recordcount, 20, 15);//(总记录数，每页记录数，每面页码个数)

$p->ar = array("«首页", "‹前页", "后页›", "末页»");//可以设置成图片HTML代码
$trunpage = $p->show_page();//得到分页信息

$sql = "select * from t_publiccode".$p->limit();

//echo $trunpage."<br>".$sql;
$db->query($sql);
//...

类似效果：
共[52600]条记录/共[2630]页 <<首页 <前页 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 后页> 末页>>
*/

var $pagecount;         //总页数

var $limit = "";        //分页时用到的limit参数

var $pagearg = "page"; //分页参数名称

var $pagesize = 20;     //每页显示记录数

var $recordcount;       //总记录数

var $pagenum;           //当前页码

var $argstr = "";       //GET参数字符串

var $perpage = 5;       //每次显示页码个数

var $ar = array("[«]", "[‹]", "[›]", "[»]");

/*
* 功能：构造函数
* 参数 $recordcount 为记录总数
* 参数 $pagesize 为每页显示记录数,默认为20
* 参数 $perpage 为每次显示页码个数,默认为5
*/
function page($recordcount, $pagesize = 20, $perpage = 5){

   $this->pagesize = $pagesize;

   $this->recordcount = $recordcount;

   $this->perpage = $perpage;

   $this->pagecount = ceil($recordcount/$pagesize);//总页数

   $this->pagenum = $this->currentpage();//当前页码

   $this->argstr = $this->newarg();//GET参数字符串

   $this->limit = " LIMIT ".($this->pagenum-1)*$pagesize.",".$pagesize;//分页时用到的limit参数
}

/*
* 功能：取得当前页码函数
*/
function currentpage(){
if(isset($_GET[$this->pagearg])){
   if($_GET[$this->pagearg] <= 0) {
     $page = 1;
   }else if($_GET[$this->pagearg] > $this->pagecount){
     $page = $this->pagecount;
   }else{
     $page = $_GET[$this->pagearg];
   }
}else {
   $page = 1;
}
return $page;
}

/*
* 功能：重新整理GET参数
*/
function newarg(){
$str = "";
$urlar = $_GET;
unset($urlar[$this->pagearg]);
if($urlar){
   foreach($urlar as $key=>$val){
    if($str == "") {
   $str = "?$key=$val";
}else {
   $str .= "&$key=$val";
}
   }
   $str .= "&$this->pagearg=";
}else{
   $str = "?$this->pagearg=";
}
return $str;
}

/*
* 功能：返回MYSQL语句的limit部分代码
*/
function limit(){
  return $this->limit;
}
/*
* 功能：分页字符输出函数
*/
function show_page(){
$trunpage = " 共[".$this->recordcount."]条记录/共[".$this->pagecount."]页 ";
$page = $this->pagenum;

//向前翻
if($page == 1){
   $trunpage .= $this->ar[0]." ".$this->ar[1]." ";
}else {
   $trunpage .= '<a href="'.$this->argstr.'1">'.$this->ar[0].'</a> <a href="'.$this->argstr.($page-1).'">'.$this->ar[1].'</a> ';
}

//中间数字翻页
$numpage = 1;
while($page - $this->perpage * $numpage > 0) $numpage++;
$startpage = ($numpage - 1) * $this->perpage;
$endpage = $this->pagecount < $numpage * $this->perpage ? $this->pagecount : $numpage * $this->perpage;
for($i = $startpage + 1; $i <= $endpage; $i++){
    $trunpage .= $i != $page ? "<a href=/"".$this->argstr.$i."/">$i</a> " : "<strong>".$i."</strong> ";
}

//向后翻
if($page == $this->pagecount || $this->pagecount == 0){
   $trunpage .= $this->ar[2]." ".$this->ar[3]." ";
}else {
   $trunpage .= '<a href="'.$this->argstr.($page+1).'">'.$this->ar[2].'</a> <a href="'.$this->argstr.$this->pagecount.'">'.$this->ar[3].'</a> ';
}

//跳转
$select = "<select onchange='location.href=this.options[this.selectedIndex].value'>/n";
for($i = 1; $i <= $this->pagecount; $i++){
   $select .= "<option value=/"".$this->argstr.$i."/">$i</option>/n";
}
$select .= "</select>";
return $trunpage.$select;
}
}
?>