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php过滤表单提交的html等危险代码_php实例

WBOY
Release: 2016-06-07 17:15:46
Original
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PHP过滤提交表单的html代码里可能有被利用引入外部危险内容的代码。例如,有些时候用户提交表单中含有html内容,但这可能造成显示页面布局混乱,需要过滤掉。

方法一:

复制代码 代码如下:

//get post data
 function PostGet($str,$post=0)
 {
  empty($str)?die('para is null'.$str.'!'):'';
 
  if( $post )
  {
   if( get_magic_quotes_gpc() )
   {
    return htmlspecialchars(isset($_POST[$str])?$_POST
[$str]:'');
   }
   else
   {
    return addslashes(htmlspecialchars(isset($_POST[$str])?
$_POST[$str]:''));
   }
  
  }
  else
  {
   if( get_magic_quotes_gpc() )
   {
    return htmlspecialchars(isset($_GET[$str])?$_GET[$str]:'');
   }
   else
   {
    return addslashes(htmlspecialchars(isset($_GET[$str])?
$_GET[$str]:''));
   }
  }
 }

方法二:

复制代码 代码如下:

function uhtml($str)    
{    
    $farr = array(    
        "/\s+/", //过滤多余空白    
         //过滤 <script>等可能引入恶意内容或恶意改变显示布局的代码,如果不需要插入flash等,还可以加入<object>的过滤 <br /> "/<(\/&#63;)(script|i&#63;frame|style|html|body|title|link|meta|\&#63;|\%)([^>]*&#63;)>/isU", <br /> "/(<[^>]*)on[a-zA-Z]+\s*=([^>]*>)/isU",//过滤javascript的on事件 <br /> ); <br /> $tarr = array( <br /> " ", <br /> "<\1\2\3>",//如果要直接清除不安全的标签,这里可以留空 <br /> "\1\2", <br /> ); <br /> $str = preg_replace( $farr,$tarr,$str); <br /> return $str; <br /> } <br /> </script>

很实用的方法吧,希望对大家能有所帮助

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