分页类

/**

• 分页类，以组件形式存在

• 13-5-15 下午8:26
  */
  class Pagination {

  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(){
      if($this->page==1)
          $html.='';
      else
          $html.="  <a href='{$this->uri}&page=1'>{$this->config["first"]}</a>  ";
  
      return $html;
  }
  
  private function prev(){
      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(){
      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(){
      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;
  
  }
  

  }