php sqliteのページネーション。

<meta charset='utf-8'><?php class SqlitePage{	public function __construct()	{			$this->table_name='';		$this->tj='';		$this->page_size='';		$this->current_page='';		$this->total_page='';		include_once 'sqlite_db.php';		$this->db=new SqliteDB();//可以调用他的操作方法了	}	function entrance($table_name,$page_size,$tj='')//sql中不包含limit   page_size为每页显示条数	{		// 首先获取当前页		// sql = "select * from tab where "+条件+" order by "+排序+" limit "+要显示多少条记录+" offset "+跳过多少条记录;		$this->page_size=$page_size;		$this->table_name=$table_name;		$this->tj=$tj;		$this->total_page=ceil($this->db->total($this->table_name,$this->tj)/$this->page_size);		if (!isset($_GET['page'])) {			$this->current_page=1;//如果没有page，则设置为默认第一页		}		else{			$this->current_page=$_GET['page'];		}		if ($this->current_page>$this->total_page) {//当当前页数目大于总页数，则设置当前页数为总页数			$this->current_page=$this->total_page;		}		if ($this->current_page<1) {//当当前页数目大于总页数，则设置当前页数为总页数			$this->current_page=1;		}		$tj=$this->tj.' limit '.$this->page_size.' offset '.($this->current_page-1)*$this->page_size;		$result=$this->db->query($this->table_name,$tj);		return $result;			}	function page_bar()	{		$old_url = $_SERVER["REQUEST_URI"]; 		$check = strpos($old_url, '?'); 		$pre_urls='test';		if ($check) {//如果urls中有？			if(substr($old_url, $check+1) == '') 			{ //有问号，但是后面没有跟任何参数				$first_urls=$old_url.'page=1';//首页				$pre_urls=$old_url.'page='.($this->current_page-1);//上一页;				$next_urls=$old_url.'page='.($this->current_page+1);//下一页;				$end_urls=$old_url.'page='.$this->total_page;//末页			} 			else {//有问号，并且有参数				if (isset($_GET['page'])) {//如果参数中包含page参数，则注销这个参数					unset($_GET['page']);					$old_url='http://'.$_SERVER['HTTP_HOST'].$_SERVER['PHP_SELF'].'?'.http_build_query($_GET);				}				$first_urls=$old_url.'&page=1';//首页				$pre_urls=$old_url.'&page='.($this->current_page-1);//上一页;				$next_urls=$old_url.'&page='.($this->current_page+1);//下一页;				$end_urls=$old_url.'&page='.$this->total_page;//末页			}		}		else{// 如果没有问号(也就是说后面没有任何参数，则直接跟)			$first_urls=$old_url.'?page=1';			$first_urls=$old_url.'?page=1';//首页			$pre_urls=$old_url.'?page='.($this->current_page-1);//上一页;			$next_urls=$old_url.'?page='.($this->current_page+1);//下一页;			$end_urls=$old_url.'?page='.$this->total_page;//末页		}				// echo $this->table_name.'table_name';					return '		<div class="page">			<a>【共'.$this->total_page.'页，第'.$this->current_page.'页】</a>			<a href="'.$first_urls.'">首页</a>			<a href="'.$pre_urls.'">上一页</a>			<a href="'.$next_urls.'">下一页</a>			<a href="'.$end_urls.'">末页</a>		</div>		';	}		public function get_total_page()	{			return ceil($this->total_record/$this->page_size);	}}// $page=new PrePage();// $res=$page->entrance('log',10);// echo "<hr />";// foreach ($res as $key => $row) {// 	echo $row['urls'].'<br />';// }// echo $page->page_bar();?>