function list_comment($pagen=1)
{
$this->session->set_userdata('page',$pagen);
$this->load->model('comment');
$this->load->library('pagebar');
$config['base_url'] = site_url().'admin/index/list_comment';
$config['total_rows'] = $this->comment->getAllTotal();
$config['per_page'] = 20;
$pages =$config['total_rows']%$config['per_page']==0?($config['total_rows']/$config['per_page']):($config['total_rows']/$config['per_page'])+1;
if($pagen>$pages)
{
$pagen=$pagen-1;
}
.................
如果游客故意搞乱，把页码改为 9999 , 会怎样？
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