php防止sql注入之过滤分页参数实例

  本文实例讲述了php防止sql注入中过滤分页参数的方法。分享给大家供大家参考。具体分析如下:

  就网络安全而言,在网络上不要相信任何输入信息,对于任何输入信息我们都必须进行参数过滤。对此,我们先来看看下面的实例:

  

复制代码 代码如下:
$this->load->library ( 'pagination' );

  $config ['base_url'] = site_url () . '/guest/show';

  $config ['total_rows'] = $c;

  $config ['per_page'] = $pernum = 15;

  $config ['uri_segment'] = 3;

  $config ['use_page_numbers'] = TRUE;

  $config ['first_link'] = '第一页';

  $config ['last_link'] = '最后一页';

  $config ['num_links'] = 5;

  $this->pagination->initialize ( $config );

  if (! $this->uri->segment ( 3 )) {

  $currentnum = 0;

  } else {

  $currentnum = is_numeric($this->uri->segment ( 3 ))?(intval($this->uri->segment ( 3 ) - 1)) * $pernum:0;

  }

  $current_page=is_numeric($this->uri->segment ( 3 ))?intval($this->uri->segment ( 3 )):1;

  if($current_page){

  $data ['title'] = '第'.$current_page.'页-留言本-防SQL注入测试';

  }

  else{

  $data ['title'] = '留言本-防SQL注入测试';

  }

  $data ['liuyan'] = $this->ly->getLy ( $pernum, $currentnum );

  其中:

  

复制代码 代码如下:
$current_page=is_numeric($this->uri->segment ( 3 ))?intval($this->uri->segment ( 3 )):1;

  $currentnum = is_numeric($this->uri->segment ( 3 ))?(intval($this->uri->segment ( 3 ) - 1)) * $pernum;

  这两句判断了参数是否为数字。防止非法字符输入。

  希望本文所述对大家的PHP程序设计有所帮助。