php 经典的分页代码类

class page{

 var $page_name="page";

 var $next_page='下一页';

 var $pre_page='上一页';

 var $first_page='首页';

 var $last_page='尾页';

 var $pre_bar='<<';

 var $next_bar='>>';

 var $format_left='';

 var $format_right='';

 var $pagebarnum=5;

 var $totalpage=0;

 var $nowindex=1;

 var $url="";

 var $offset=0;

 var $rewrite = array();

 function page($array)

 {

  if(is_array($array)){

     if(!array_key_exists('total',$array))$this->error(__function__,'need a param of total');

     $total=intval($array['total']);

     $perpage=(array_key_exists('perpage',$array))?intval($array['perpage']):10;

     $nowindex=(array_key_exists('nowindex',$array))?intval($array['nowindex']):'';

     $url=(array_key_exists('url',$array))?$array['url']:'';

     $action = (array_key_exists('action', $array)) ? $array['action'] : '';
     $id0 = (array_key_exists('id0', $array)) ? $array['id0'] : '';
  $id1 = (array_key_exists('id1', $array)) ? $array['id1'] : '';
  $id2 = (array_key_exists('id2', $array)) ? $array['id2'] : '';
  $id3 = (array_key_exists('id3', $array)) ? $array['id3'] : '';

  }else{

     $total=$array;

     $perpage=10;

     $nowindex='';

     $url='';

     $action = '';
     $id0 = '';
     $id1 = '';
     $id2 = '';
  $id3 = '';

  }

  if((!is_int($total))||($total<0))$this->error(__function__,$total.' is not a positive integer!');

  if((!is_int($perpage))||($perpage<=0))$this->error(__function__,$perpage.' is not a positive integer!');

  if(!empty($array['page_name']))$this->set('page_name',$array['page_name']);

  $this->_set_nowindex($nowindex);

  $this->_set_url($url);

  $this->totalpage=ceil($total/$perpage);

  $this->offset=($this->nowindex-1)*$perpage;

  $this->action = $action;
  $this->rewrite = array('action'=>$action,'id0'=>$id0, 'id1'=>$id1, 'id2'=>$id2, 'id3'=>$id3);
 }

 function set($var,$value)
 {

  if(in_array($var,get_object_vars($this)))

     $this->$var=$value;

  else {

   $this->error(__function__,$var." does not belong to pb_page!");

  }

 }

 function next_page($style=''){
  if($this->nowindex<$this->totalpage){
  return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
 }
 return ''.$this->next_page.'';
 }

 function pre_page($style=''){
  if($this->nowindex>1){
    return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
  }
  return ''.$this->pre_page.'';
 }

 function first_page($style=''){
  if($this->nowindex==1){
     return ''.$this->first_page.'';
  }
  return $this->_get_link($this->_get_url(1),$this->first_page,$style);
 }

 function last_page($style=''){
  if($this->nowindex==$this->totalpage||$this->totalpage==0){

      return ''.$this->last_page.'';

  }

  return $this->_get_link($this->_get_url($this->totalpage),$this->last_page,$style);

 }

 function nowbar($style='',$nowindex_style='')

 {

  $plus=ceil($this->pagebarnum/2);

  if($this->pagebarnum-$plus+$this->nowindex>$this->totalpage)$plus=($this->pagebarnum-$this->totalpage+$this->nowindex);

  $begin=$this->nowindex-$plus+1;

  $begin=($begin>=1)?$begin:1;

  $return='';

  for($i=$begin;$i<$begin+$this->pagebarnum;$i++)

  {

   if($i<=$this->totalpage){

    if($i!=$this->nowindex)

        $return.=$this->_get_text($this->_get_link($this->_get_url($i),$i,$style));

    else

        $return.=$this->_get_text(''.$i.'');

   }else{

    break;

   }

   $return.=" ";

  }

  unset($begin);

  return $return;

 }

 /**

  * 获取显示跳转按钮的代码

  *

  * @return string

  */

 function select()

 {

   $return='';

  for($i=1;$i<=$this->totalpage;$i++)

  {

   if($i==$this->nowindex){

    $return.='

'.$i.'';

   }else{

    $return.='

'.$i.'';

   }

  }

  unset($i);

  $return.='

';

  return $return;

 }

 /**

  * 获取mysql教程 语句中limit需要的值

  *

  * @return string

  */

 function offset()

 {

  return $this->offset;

 }

 /**

  * 控制分页显示风格（你可以增加相应的风格）

  *

  * @param int $mode

  * @return string

  */

 function show($mode=1)

 {

  switch ($mode)

  {

   case '1':

    $this->next_page='下一页';

    $this->pre_page='上一页';

    return $this->pre_page().$this->nowbar().$this->next_page().'第'.$this->select().'页';

    break;

   case '2':

    $this->next_page='下一页';

    $this->pre_page='上一页';

    $this->first_page='首页';

    $this->last_page='尾页';

    return $this->first_page().$this->pre_page().'[第'.$this->nowindex.'页]'.$this->next_page().$this->last_page().'第'.$this->select().'页';

    break;

   case '3':

    $this->next_page='下一页';

    $this->pre_page='上一页';

    $this->first_page='首页';

    $this->last_page='尾页';

    return $this->first_page("page_box")."".$this->pre_page("page_box")."".$this->nowbar("page_box_a","page_box_b")."".$this->next_page("page_box")."".$this->last_page("page_box")."";

    break;

   case '4':

    $this->next_page='下一页';

    $this->pre_page='上一页';

    return $this->pre_page().$this->nowbar().$this->next_page();

    break;

   case '5':

    return $this->pre_bar().$this->pre_page().$this->nowbar().$this->next_page().$this->next_bar();

    break;

  }

 }

 function _set_url($url="")

 {

  if(!empty($url)){

   $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";

  }else{

   if(empty($_server['query_string'])){

    $this->url=$_server['request_uri']."?".$this->page_name."=";

   }else{

    if(stristr($_server['query_string'],$this->page_name.'=')){

     $this->url=str_replace($this->page_name.'='.$this->nowindex,'',$_server['request_uri']);

     $last=$this->url[strlen($this->url)-1];

     if($last=='?'||$last=='&'){

         $this->url.=$this->page_name."=";

     }else{

         $this->url.='&'.$this->page_name."=";

     }

    }else{

     $this->url=$_server['request_uri'].'&'.$this->page_name.'=';

    }

   }

  }

 }

 function _set_nowindex($nowindex)

 {

  if(empty($nowindex)){

   if(isset($_get[$this->page_name])){

    $this->nowindex=intval($_get[$this->page_name]);

   }

  }else{

   $this->nowindex=intval($nowindex);

  }

 }

 function _get_url($pageno=1)
 {
  global $_cfg;
  $arr = $this->rewrite;
 //print_r($arr);
 //print_r($this->url.$pageno);
  if($_cfg['urlrewrite'] && !empty($arr['action'])){
   return url_rewrite($arr['action'], array('id0'=>$arr['id0'],'id1'=>$arr['id1'],'id2'=>$arr['id2'],'id3'=>$arr['id3'],'page'=>$pageno));
  }else{
   return $this->url.$pageno;
  }

 }

 function _get_text($str)

 {

  return $this->format_left.$str.$this->format_right;

 }

 function _get_link($url,$text,$style=''){

  $style=(empty($style))?'':'class="'.$style.'"';

  return ''.$text.'';

 }

 function error($function,$errormsg)

 {

     die('error in file '.__file__.' ,function '.$function.'() :'.$errormsg);

 }

}
?>