PHP paging class extension code_PHP tutorial

/**
* Function: Pagination class, based on the total amount of data provided and page size
* Created date: Fri Apr 20 16:45:21 CST 2007
* Last updated:
* Author: sanshi < ;sanshi0815@tom.com>
*/

class pagination
{
var $result = array();
var $pVar = "myp";//Page parameter paging count
var $urlParamStr = ""; //All parameters of the page
var $sqlMoveNumber = 0; //Data offset
var $is_post = false;

public function pagination()
{

}
public function set($sum,$pageSize,$page="",$is_post = false)
{
$this->is_post = $is_post;
$this->pVar = defined('PAGE_BAR') ? PAGE_BAR : 'myp' ;
$url = $_SERVER['PHP_SELF '].'?'.$_SERVER['QUERY_STRING'];
                                                                                                                                                                                       sumPage'] = ceil($sum/$pageSize);
                                                                                                                                                                    ];
$temp['curPage'] = $curPage;
$temp['nextPage'] = $temp['sumPage'] > $curPage ? ($curPage+1) : $temp[' sumPage'];
$temp['upPage'] = $curPage >1 ? $curPage-1 :1;
$temp['endPage'] = $temp['sumPage'];
$this->urlParamStr = $this->_makeUrl($url);
$temp['urlPageStr'] = ($page=="") ? $this->_makeUrl($url) : $ page.$this->urlParamStr;

$this->sqlMoveNumber = $curPage <2 ? 0 : ($curPage-1)*$pageSize;
$temp['sqlMoveNumber'] = $this->sqlMoveNumber;
$temp['rowNo'] = $sum;
$this->result = $temp; /print_r($temp);exit();
}
public function getSqlMove()
{
return $this->sqlMoveNumber;
}
public function getFooter()
{
$str= "Total{$this->result['rowNo']}result['upPage']}'";
   if($this->is_post) $str .=" onclick='return sanshi_page_post(this.href ,{$this->result['upPage']});' ";
$str .=" >Previous Page ";
$str .=" Current{$ this->result['curPage']} page";
$str .=" There are {$this->result['sumPage']} pages";
$str .=" result['nextPage']}'";
   if($this->is_post) $str .=" onclick ='return sanshi_page_post(this.href, {$this->result['nextPage']});' "; return $str;
}
public function getJumpPage()
{
if($this->is_post)
{
$str = " Jump to  ​ }else{
            $str = " 跳到第 n";
        }
for($i=1;$i<=$this->result['sumPage'];$i++)
{
$str .= ($i==$this->result['curPage']) ? "$in" : "$in";
}
$str.=" 页";
         //输出form表单
        if($this->is_post)
        {
            $str .="";
            $str .="

";
            $str .="";
            $_POST = isset($_POST) ? $_POST : array();
            foreach($_POST AS $k=>$v)
            {
                $str .="";
            }
            $str .="

";
        }
return $str;
    }
    public function getCurPage()
    {
        return isset($_GET[$this->pVar]) ? intval($_GET[$this->pVar]) : 1 ;
    }
    //分析出url的参数返回？后的参数，页码为空 包括问号
    private function _makeUrl($url)
    {
        $arrayUrl=parse_url($url);
        if(isset($arrayUrl['query']))
        {
            $q=$arrayUrl['query'];
            parse_str($q,$qParam);
            //print_r($qParam);
            if(array_key_exists($this->pVar,$qParam))
            {
                foreach ($qParam AS $k=>$v)
                {
                    if($k !=$this->pVar) $temp[$k] = $v;
                }
                $temp[$this->pVar] = "";
                if(function_exists("http_build_query"))
                    return '?'.http_build_query($temp);
                else
                    return '?'.sanshi_http_build_query($temp);
            }else {
                return "?{$q}&{$this->pVar}=";
            }
        }else{
            return "?{$this->pVar}=";
        }

    }
}
function sanshi_http_build_query($a,$b='',$c=0)
{
    if (!is_array($a)) return false;
    foreach ((array)$a as $k=>$v)
    {
        if ($c)
            $k=$b."[".$k."]";
        elseif (is_int($k))
            $k=$b.$k;
        if (is_array($v)||is_object($v))
        {
            $r[]=http_build_query($v,$k,1);
            continue;
        }
        $r[]=$k."=".urlencode($v);
    }
    return implode("&",$r);
}
/*
//print_r($_SERVER);
$p = new pagination();
$p->set(10,2,'thi.php');
echo $p->getFooter();
echo $p->getJumpPage();
*/
?>