yii分页组件用法实例分析

public function actionindex(){
  $user=user::model();
  //分页的使用
  $count=$user->count(); //获取总页数
  $pagesize=3; //每一页显示的记录条数
  $page=new page($count,$pagesize);
  $sql="select * from {{user}} $page->limit";
  $info=$user->findallbysql($sql);
  $show_page=$page->fpage();
  $this->renderpartial("index",array("info"=>$info,'show_page'=>$show_page));
}

<?php
/**
 * 分页类，以组件形式存在于componnets文件中
 */
class page {
  private $total; //数据表中总记录数
  private $listrows; //每页显示行数
  private $limit;
  private $uri;
  private $pagenum; //页数
  private $config=array('header'=>"个记录", "prev"=>"上一页", "next"=>"下一页", "first"=>"首 页", "last"=>"尾 页");
  private $listnum=8;
  /*
   * $total
   * $listrows
   */
  public function __construct($total, $listrows=10, $pa=""){
   $this->total=$total;
   $this->listrows=$listrows;
   $this->uri=$this->geturi($pa);
   $this->page=!empty($_get["page"]) ? $_get["page"] : 1;
   $this->pagenum=ceil($this->total/$this->listrows);
   $this->limit=$this->setlimit();
  }
  private function setlimit(){
   return "limit ".($this->page-1)*$this->listrows.", {$this->listrows}";
  }
  private function geturi($pa){
   $url=$_server["request_uri"].(strpos($_server["request_uri"], '?')?'':"?").$pa;
   $parse=parse_url($url);
   if(isset($parse["query"])){
    parse_str($parse['query'],$params);
    unset($params["page"]);
    $url=$parse['path'].'?'.http_build_query($params);
   }
   return $url;
  }
  function __get($args){
   if($args=="limit")
    return $this->limit;
   else
    return null;
  }
  private function start(){
   if($this->total==0)
    return 0;
   else
    return ($this->page-1)*$this->listrows+1;
  }
  private function end(){
   return min($this->page*$this->listrows,$this->total);
  }
  private function first(){
      $html='';
   if($this->page==1)
    $html.='';
   else
    $html.=" <a href='{$this->uri}&page=1'>{$this->config["first"]}</a> ";
   return $html;
  }
  private function prev(){
      $html='';
   if($this->page==1)
    $html.='';
   else
    $html.=" <a href='{$this->uri}&page=".($this->page-1)."'>{$this->config["prev"]}</a> ";
   return $html;
  }
  private function pagelist(){
   $linkpage="";
   $inum=floor($this->listnum/2);
   for($i=$inum; $i>=1; $i--){
    $page=$this->page-$i;
    if($page<1)
     continue;
    $linkpage.=" <a href='{$this->uri}&page={$page}'>{$page}</a> ";
   }
   $linkpage.=" {$this->page} ";
   for($i=1; $i<=$inum; $i++){
    $page=$this->page+$i;
    if($page<=$this->pagenum)
     $linkpage.=" <a href='{$this->uri}&page={$page}'>{$page}</a> ";
    else
     break;
   }
   return $linkpage;
  }
  private function next(){
      $html='';
   if($this->page==$this->pagenum)
    $html.='';
   else
    $html.=" <a href='{$this->uri}&page=".($this->page+1)."'>{$this->config["next"]}</a> ";
   return $html;
  }
  private function last(){
      $html='';
   if($this->page==$this->pagenum)
    $html.='';
   else
    $html.=" <a href='{$this->uri}&page=".($this->pagenum)."'>{$this->config["last"]}</a> ";
   return $html;
  }
  private function gopage(){
   return ' <input type="text" onkeydown="javascript:if(event.keycode==13){var page=(this.value>'.$this->pagenum.')?'.$this->pagenum.':this.value;location=''.$this->uri.'&page='+page+''}" value="'.$this->page.'" style="width:25px"><input type="button" value="go" onclick="javascript:var page=(this.previoussibling.value>'.$this->pagenum.')?'.$this->pagenum.':this.previoussibling.value;location=''.$this->uri.'&page='+page+''"> ';
  }
  function fpage($display=array(0,1,2,3,4,5,6,7,8)){
   $html[0]=" 共有<b>{$this->total}</b>{$this->config["header"]} ";
   $html[1]=" 每页显示<b>".($this->end()-$this->start()+1)."</b>条，本页<b>{$this->start()}-{$this->end()}</b>条 ";
   $html[2]=" <b>{$this->page}/{$this->pagenum}</b>页 ";
   $html[3]=$this->first();
   $html[4]=$this->prev();
   $html[5]=$this->pagelist();
   $html[6]=$this->next();
   $html[7]=$this->last();
   $html[8]=$this->gopage();
   $fpage='';
   foreach($display as $index){
    $fpage.=$html[$index];
   }
   return $fpage;
  }
}