一个简单且很好用的php分页类

class page {
    // 分页栏每页显示的页数
    public $rollpage = 6;
    // 页数跳转时要带的参数
    public $parameter  ;
    // 默认列表每页显示行数
    public $listrows = 20;
    // 起始行数
    public $firstrow ;
    // 分页总页面数
    protected $totalpages  ;
    // 总行数
    protected $totalrows  ;
    // 当前页数
    protected $nowpage    ;
    // 分页的栏的总页数
    protected $coolpages   ;
    // 分页显示定制
    protected $config  = array(
     'redirect'=>false,
     'header'=>'条记录',
     'prev'=>'上一页',
     'next'=>'下一页',
     'first'=>'1',
     'last'=>'最后一页',
     'theme'=>' <div class="part1">%uppage% %first%  %prepage%  %linkpage%  %nextpage% %downpage%</div> <div class="part2">共  %totalpage% 页');
    // 默认分页变量名
    protected $varpage;

    /**
     +----------------------------------------------------------
     * 架构函数
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     * @param array $totalrows  总的记录数
     * @param array $listrows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     +----------------------------------------------------------
     */
    public function __construct($totalrows,$listrows='',$parameter='') {
        $this->totalrows = $totalrows;
        $this->parameter = $parameter;
        $this->varpage = c('var_page') ? c('var_page') : 'p' ;
        if(!empty($listrows)) {
            $this->listrows = intval($listrows);
        }
        $this->totalpages = ceil($this->totalrows/$this->listrows);     //总页数
        $this->coolpages  = ceil($this->totalpages/$this->rollpage);
        //$_get验证
        $this->nowpage = intval($_get[$this->varpage]);
        $this->nowpage = $this->nowpage > 0 ? $this->nowpage : 1;

        if(!empty($this->totalpages) && $this->nowpage>$this->totalpages) {
            $this->nowpage = $this->totalpages;
        }
        $this->firstrow = $this->listrows*($this->nowpage-1);
    }

    public function setconfig($name,$value) {
        if(isset($this->config[$name])) {
            $this->config[$name]    =   $value;
        }
    }

    /**
     +----------------------------------------------------------
     * 分页显示输出
     +----------------------------------------------------------
     * @access public
     +----------------------------------------------------------
     */
    public function show() {

     if(0 == $this->totalrows) return '';

     //处理参数
        $p = $this->varpage;
        $url  =  $_server['request_uri'].(strpos($_server['request_uri'],'?')?'':"?").$this->parameter;
        $parse = parse_url($url);
        if(isset($parse['query'])) {
            parse_str($parse['query'],$params);
            unset($params[$p]);
            $url   =  $parse['path'].'?'.http_build_query($params);
        }

        /* 分页逻辑  */      

        //当总数小于显示的页码数
        if ($this->totalpages <= $this->rollpage) {
         $start = 1;
         $end   = $this->totalpages;
        }
        else{
         //
         if  ($this->nowpage <= $this->rollpage - 1) {
          $start = 1;
          $end   = $this->rollpage;

          $islast = true;
         } 
         else if ($this->nowpage > $this->totalpages - $this->rollpage + 1) {
          $start = $this->totalpages - ($this->rollpage - 1);
          $end   = $this->totalpages;

          $isfirst = true;
         }
         else{
          //浮动数
          $size = floor($this->rollpage / 2);

          $start = $this->nowpage - $size;
          $end   = $this->nowpage + $size;

          $isfirst = true;
          $islast = true;
         }
        }

        //上下翻页字符串
        $uprow   = $this->nowpage - 1;
        $downrow = $this->nowpage + 1;

       
        /* 拼装html */

        //< 1...     ...last >
        if ($isfirst){
         $thefirst = "<a class='firstpage' href='".$url."&".$p."=1' >".$this->config['first']."</a>";
        }
        if ($islast){
         $theend = "<a class='lastpage' href='".$url."&".$p."=$this->totalpages' >".$this->config['last']."</a>";
        }

        if ($uprow > 0){
         $uppage = "<a class='uppage' href='".$url."&".$p."=$uprow'>".$this->config['prev']."</a>";
        }

        if ($downrow <= $this->totalpages){
         $downpage = "<a class='downpage' href='".$url."&".$p."=$downrow'>".$this->config['next']."</a>";
        }

       if($start==3){
         $linkpage .= "<a href='".$url."&".$p."=2'>2</a>";
        }
        if($start>=4){
         $linkpage .= "<a href='".$url."&".$p."=2'>2</a> <span class='noendclass'>...</span>";
        }
        //1 2 3 4 5
        for($i=$start;$i<=$end;$i++){
         if($i!=$this->nowpage){
          $linkpage .= " <a href='".$url."&".$p."=$i'> ".$i." </a>";
         }else{
          $linkpage .= " <span class='current'>".$i."</span>";
         }
         if($i==$end){
          if($i<$this->totalrows){
           $linkpage .= " <span class='noendclass'>...</span>";
          }
         }
        }

        $pagestr = str_replace(
            array('%header%','%nowpage%','%totalrow%','%totalpage%','%uppage%','%first%','%prepage%','%linkpage%','%nextpage%','%downpage%','%end%'),
            array($this->config['header'],$this->nowpage,$this->totalrows,$this->totalpages,$uppage,$thefirst,$prepage,$linkpage,$nextpage,$downpage,$theend),$this->config['theme']);

        //显示模式  普通false 带跳转ture
        if (!empty($this->config['redirect'])){
         $html = $pagestr;

        }else{
         //传递参数
         if($this->totalpages > 1){
          $redirect = " 到第 <form method='get' action=''><input name=".$p." type='text' class='page_text' size='3' maxlength='3' value='" . $this->nowpage ."'/> 页 <input type='submit' class='page_btn' value='确定' />";
          if ($params){
           foreach($params as $k => $v){
            $string .= "<input type='hidden' name='" . $k . "' value='" . $v . "'/>";
           }
           $redirect = $redirect . $string . '</form></div>';
          }else{
           $redirect = $redirect . '</form></div>';
          }
         }
         //生成html字符串
         $html = $pagestr . $redirect;      
        } 
        return $html;
    }

}