<meta charset='utf-8'>
<"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, '"page">
      <a>【共'.$this->total_page.'页，第'.$this->current_page.'页】</a>
      <a href="'.$first_urls.'" rel="external nofollow" >首页</a>
      <a href="'.$pre_urls.'" rel="external nofollow" >上一页</a>
      <a href="'.$next_urls.'" rel="external nofollow" >下一页</a>
      <a href="'.$end_urls.'" rel="external nofollow" >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();
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