php基于SQLite实现的分页功能示例

<meta charset='utf-8'><?phpclass 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.'" 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();?>