php mysql paging class (php novice entry)

/***
* php mysql paging class
* Organizing http://bbs.it-home.org
*/
class Pagination{
    private $_result;
    private $_count; //记录数
    private $_pageMax; //最大页
    private $_page; //当前页
    private $_url;
    private $_startPage;//分页条起码
    private $_endPage;  // 分页条止码
    private $_nextPage; //上一页
    private $_prePage; //下一页
    function __construct($table, $pageSize, $getPage){
        $this->_result = $GLOBALS['db']->query('SELECT * FROM  '.$table);
        $this->_count = $GLOBALS['db']->getRecordNum();
        $this->_pageMax = ceil($this->_count/$pageSize);
        $this->_result = '';
        if($_GET[$getPage] == '')
            $this->_page = 1;
        else
            $this->_page= max(intval($_GET[$getPage]), 1);

        $this->_page = min($this->_page, $this->_pageMax);
        $offset = ($this->_page - 1) * $pageSize;
        $sql = 'SELECT * FROM '.$table.' LIMIT '. $offset .','. $pageSize;
        $this->_result = $GLOBALS['db']->query($sql);
     }

    function getRecord(){
         return $GLOBALS['db']->getRecord();
    }

    function getPageBar($url = '?', $barLn = 10, $style = 1){
        if($style == 1){
            if($barLn % 2 != 0 ){
                $midder = ceil($barLn / 2);
                $big_repair = $midder - 1 ;//当上面以进一法取整，则这里为减1，反之为加1
            }else{
                $midder = $big_repair = $barLn / 2;
            }
            $sml_repair = $midder- 1;

            $this->_startPage = ($this->_page  + $midder) > $this->_pageMax ? $this->_pageMax  - $barLn : $this->_page - $sml_repair;
            $this->_endPage = $this->_page < $midder ? $barLn : $this->_page + $big_repair;

         }elseif($style == 2){

             if($this->_page % $barLn == 0){
                 $this->_startPage = $this->_page;
             }else{
                 $this->_startPage = ($this->_page > $barLn)? $this->_page - ($this->_page % $barLn ) : 1;
             }
             $this->_endPage = $this->_startPage + $barLn - 1;
        }
        $this->_url       = $url;
        $this->_nextPage  = $this->_page + 1;
        $this->_prePage   = $this->_page - 1;
        $this->_startPage = max($this->_startPage, 1);//至少从第一页开始
        $this->_endPage   = min($this->_endPage, $this->_pageMax);//最多只到末页


        $this->_result = '当前是：'.$this->_page.'/'.$this->_pageMax.'页，共'.$this->_count.'条记录';

         if ($this->_page > 1)
             $this->_result .= '
                                    9
                               ';
         else
             $this->_result .= '9
                          3';

         for($i = $this->_startPage; $i <= $this->_endPage; $i++) {
             if ($this->_page == $i)
                 $this->_result .= ''.$i.'';
             else
                 $this->_result.= ''.$i.'';
         }

         if ($this->_page != $this->_pageMax) {
             $this->_result .= '4';
             $this->_result .= ':';
         } else {
            $this->_result.= '4:';
         }

             $this->_result.= '


        ';
        return $this->_result;
    }
}
?>

2、调用示例

$page = new Pagination($table, 5, 'page');
while($row = $page->getRecord()){
echo $row[0],'';
}
echo $page->getPageBar('?',8, 1);
?>