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php过滤危险html代码

Jun 21, 2016 am 08:57 AM

用PHP过滤html里可能被利用来引入外部危险内容的代码。有些时候,需要让用户提交html内容,以便丰富用户发布的信息,当然,有些可能造成显示页面布局混乱的代码也在过滤范围内。

#用户发布的html,过滤危险代码
function uh($str)
{
    $farr = array(
        "/\s+/",                                                                                            //过滤多余的空白
        "/]*?)>/isU",  //过滤 <script></script>         "/(]*)on[a-zA-Z]+\s*=([^>]*>)/isU",                                      //过滤javascript的on事件
     
   );
   $tarr = array(
        " ",
        "<\\1\\2\\3>",           //如果要直接清除不安全的标签,这里可以留空
        "\\1\\2",
   );

  $str = preg_replace( $farr,$tarr,$str);
   return $str;
}



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