PHP翻页类

<?php
/**
 * filename: ext_page.class.php
 * @package:phpbean
 * @author :feifengxlq<feifengxlq#gmail.com><[url=http://www.phpobject.net/]http://www.phpobject.net/[/url]>
 * @copyright :Copyright 2006 feifengxlq
 * @license:version 2.0
 * @create:2006-5-31
 * @modify:2006-6-1
 * @modify:feifengxlq 2006-11-4
 * descrīption:超强分页类，四种分页模式，默认采用类似baidu,google的分页风格。
 * 2.0增加功能：支持自定义风格，自定义样式，同时支持PHP4和PHP5,
 * to see detail,please visit [url=http://www.phpobject.net/blog/read.php]http://www.phpobject.net/blog/read.php[/url]?
 * example:
 * 模式四种分页模式：
   require_once('../libs/classes/page.class.php');
   $page=new page(array('total'=>1000,'perpage'=>20));
   echo 'mode:1<br>'.$page->show();
   echo '<hr>mode:2<br>'.$page->show(2);
   echo '<hr>mode:3<br>'.$page->show(3);
   echo '<hr>mode:4<br>'.$page->show(4);
   开启AJAX：
   $ajaxpage=new page(array('total'=>1000,'perpage'=>20,'ajax'=>'ajax_page','page_name'=>'test'));
   echo 'mode:1<br>'.$ajaxpage->show();
   采用继承自定义分页显示模式：
   demo:[url=http://www.phpobject.net/blog]http://www.phpobject.net/blog[/url]
 */
class _page
{
 /**
  * config ,public
  */
 var $page_name="PB_page";//page标签，用来控制url页。比如说xxx.php?PB_page=2中的PB_page
 var $next_page='>';//下一页
 var $pre_page='<';//上一页
 var $first_page='First';//首页
 var $last_page='Last';//尾页
 var $pre_bar='<<';//上一分页条
 var $next_bar='>>';//下一分页条
 var $format_left='[';
 var $format_right=']';
 var $is_ajax=false;//是否支持AJAX分页模式
 
 /**
  * private
  *
  */
 var $pagebarnum=10;//控制记录条的个数。
 var $totalpage=0;//总页数
 var $ajax_action_name='';//AJAX动作名
 var $nowindex=1;//当前页
 var $url="";//url地址头
 var $offset=0;
 
 /**
  * constructor构造函数
  *
  * @param array $array['total'],$array['perpage'],$array['nowindex'],$array['url'],$array['ajax']...
  */
 function page($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']:'';
  }else{
     $total=$array;
     $perpage=10;
     $nowindex='';
     $url='';
  }
  if((!is_int($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']);//设置pagename
  $this->_set_nowindex($nowindex);//设置当前页
  $this->_set_url($url);//设置链接地址
  $this->totalpage=ceil($total/$perpage);
  $this->offset=($this->nowindex-1)*$perpage;
  if(!empty($array['ajax']))$this->open_ajax($array['ajax']);//打开AJAX模式
 }
 /**
  * 设定类中指定变量名的值，如果改变量不属于这个类，将throw一个exception
  *
  * @param string $var
  * @param string $value
  */
 function set($var,$value)
 {
  if(in_array($var,get_object_vars($this)))
     $this->$var=$value;
  else {
   $this->error(__FUNCTION__,$var." does not belong to PB_Page!");
  }
 
 }
 /**
  * 打开倒AJAX模式
  *
  * @param string $action 默认ajax触发的动作。
  */
 function open_ajax($action)
 {
  $this->is_ajax=true;
  $this->ajax_action_name=$action;
 }
 /**
  * 获取显示"下一页"的代码
  *
  * @param string $style
  * @return string
  */
 function next_page($style='')
 {
  if($this->nowindex<$this->totalpage){
   return $this->_get_link($this->_get_url($this->nowindex+1),$this->next_page,$style);
  }
  return '<span class="'.$style.'">'.$this->next_page.'</span>';
 }
 
 /**
  * 获取显示“上一页”的代码
  *
  * @param string $style
  * @return string
  */
 function pre_page($style='')
 {
  if($this->nowindex>1){
   return $this->_get_link($this->_get_url($this->nowindex-1),$this->pre_page,$style);
  }
  return '<span class="'.$style.'">'.$this->pre_page.'</span>';
 }
 
 /**
  * 获取显示“首页”的代码
  *
  * @return string
  */
 function first_page($style='')
 {
  if($this->nowindex==1){
      return '<span class="'.$style.'">'.$this->first_page.'</span>';
  }
  return $this->_get_link($this->_get_url(1),$this->first_page,$style);
 }
 
 /**
  * 获取显示“尾页”的代码
  *
  * @return string
  */
 function last_page($style='')
 {
  if($this->nowindex==$this->totalpage){
      return '<span class="'.$style.'">'.$this->last_page.'</span>';
  }
  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('<span class="'.$nowindex_style.'">'.$i.'</span>');
   }else{
    break;
   }
   $return.="\n";
  }
  unset($begin);
  return $return;
 }
 /**
  * 获取显示跳转按钮的代码
  *
  * @return string
  */
 function select()
 {
   $return='<select name="PB_Page_Select" onchange="PageSelect()">';
  for($i=1;$i<=$this->totalpage;$i++)
  {
   if($i==$this->nowindex){
    $return.='<option value="'.$i.'" selected>'.$i.'</option>';
   }else{
    $return.='<option value="'.$i.'">'.$i.'</option>';
   }
  }
  unset($i);
  $return.='</select>';
  return $return;
 }
 
 /**
  * 获取mysql 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 $this->first_page().$this->pre_page().$this->next_page().$this->last_page();
    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;
   case '6':
    return $this->select();
    break;
   case '7':
    return $this->nowbar();
    break;
  }
 
 }
/*----------------private function (私有方法)-----------------------------------------------------------*/
 /**
  * 设置url头地址
  * @param: String $url
  * @return boolean
  */
 function _set_url($url="")
 {
  if(!empty($url)){
      //手动设置
   $this->url=$url.((stristr($url,'?'))?'&':'?').$this->page_name."=";
  }else{
      //自动获取
   if(empty($_SERVER['QUERY_STRING'])){
       //不存在QUERY_STRING时
    $this->url=$_SERVER['REQUEST_URI']."?".$this->page_name."=";
   }else{
       //
    if(stristr($_SERVER['QUERY_STRING'],$this->page_name.'=')){
        //地址存在页面参数
     $this->url=str_replace($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.'=';
    }//end if    
   }//end if
  }//end if
 }
 
 /**
  * 设置当前页面
  *
  */
 function _set_nowindex($nowindex)
 {
  if(empty($nowindex)){
   //系统获取
   
   if(isset($_GET[$this->page_name])){
    $this->nowindex=intval($_GET[$this->page_name]);
   }
   if(isset($_POST['PB_Page_Select'])){
        $this->nowindex=$_POST['PB_Page_Select'];
     }
  }else{
      //手动设置
   $this->nowindex=intval($nowindex);
  }
 }
 
 /**
  * 为指定的页面返回地址值
  *
  * @param int $pageno
  * @return string $url
  */
 function _get_url($pageno=1)
 {
  return $this->url.$pageno;
 }
 
 /**
  * 获取分页显示文字，比如说默认情况下_get_text('<a href="">1</a>')将返回[<a href="">1</a>]
  *
  * @param String $str
  * @return string $url
  */
 function _get_text($str)
 {
  return $this->format_left.$str.$this->format_right;
 }
 
 /**
   * 获取链接地址
 */
 function _get_link($url,$text,$style=''){
  $style=(empty($style))?'':'class="'.$style.'"';
  if($this->is_ajax){
      //如果是使用AJAX模式
   return '<a '.$style.' href="javascrīpt:'.$this->ajax_action_name.'(\''.$url.'\')">'.$text.'</a>';
  }else{
   return '<a '.$style.' href="'.$url.'">'.$text.'</a>';
  }
 }
 /**
   * 出错处理方式
 */
 function error($function,$errormsg)
 {
     die('Error in file <b>'.__FILE__.'</b> ,Function <b>'.$function.'()</b> :'.$errormsg);
 }
}

// 继承分页类，加入数据库访问能力.
class Page extends _Page {
    var $db; //db connected object
    var $_Sql_Query = ''; //查询数据库的sql
    var $_Total = 0; //查询到的总记录.必须先是
    var $_Rst = array(); //查询到的记录.
    /**
     * 分页查询类库.
     *
     * @param String $Sql 记录查询的SQL 语句.
     * @param int $pagenuber 每页多少条记录.
     * @param int $pagen 当前页面.
     * @param String $url 分页链接带入的参数. index.php?xx=b&bb=33
     * @param String $pname 当前第几页的标记,默认是 index.php?xx=b&bb=33&page=2 如果有特殊要求
可以修改 $pname的参数. 比如: $pname='db_page',则变成: index.php?xx=b&bb=33&db_page=2
     * @return Mysql_Page
     */

    function Page($db, $sql_query = '', $max_rows_per_page = 20, $current_page_number = 0, $url = '', $parameters = '', $pname = 'PB_page',$otc = '*') {
        $this -> db = $db;
        $pos_to = strlen($sql_query);
        $pos_from = strpos($sql_query, ' from', 0);
        $pos_group_by = strpos($sql_query, ' group by', $pos_from);
        if (($pos_group_by < $pos_to) && ($pos_group_by != false)) $pos_to = $pos_group_by;
        $pos_having = strpos($sql_query, ' having', $pos_from);
        if (($pos_having < $pos_to) && ($pos_having != false)) $pos_to = $pos_having;
        $pos_order_by = strpos($sql_query, ' order by', $pos_from);
        if (($pos_order_by < $pos_to) && ($pos_order_by != false)) $pos_to = $pos_order_by;
        $reviews_count = $this -> db -> getResults("select count($otc) as total " . substr($sql_query, $pos_from, ($pos_to - $pos_from)));
        $query_num_rows = $reviews_count[0]['total'];
        $this -> _Total = $query_num_rows;
        $num_pages = ceil($query_num_rows / $max_rows_per_page);
        if ($current_page_number > $num_pages) {
            $current_page_number = $num_pages;
        }
        $offset = ($max_rows_per_page * ($current_page_number - 1));
        if ($offset < 0) $offset = 0;
        if ($offset > 0) {
            $offset = $offset + 1;
        }
        $this -> _Sql_Query = $sql_query . " limit " . $offset . ", " . $max_rows_per_page;
        $this -> setData(); //查询数据库.
        parent :: page(array('total' => $query_num_rows, 'perpage' => $max_rows_per_page, 'page_name' => $pname, 'url' => $url, 'parameters' => $parameters));
    }

    /**
     * 取得当前页面的记录,返回一个数组.
     */
    function findByAll() {
        return $this -> _Rst;
    }
    /**
     * 显示分页信息.
     *
     * @param int $model
     */
    function dispaly_links($model) {
        $this -> show($model);
    }
    /**
     * 返回记录数.
     *
     * @return Int
     */
    function getCount() {
        return $this -> _Total;
    }
    /**
     * 取查询结果记录数..
     *
     * @return Int
     */
    function getRows() {
        return count($this -> _Rst);
    }
    /**
     * 执行查询功能.
     * 计算数组.
     * 私有方法.
     */
    function setData() {
        $this -> _Rst = $this -> db -> getResults($this -> _Sql_Query);
    }
}

?>