php中的xss攻击过滤函数
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下面分享几个php脚本中关于xss攻击过滤的自定义函数，过滤xss可以提高网站整体的安全性，也可以保证mysql数据的安全。下面的xss攻击过滤函数大家可以参考一下。
php过滤xss攻击的函数
例：php过滤xss的函数
/**
* # php过滤XSS攻击的函数
* @param string $str 需要过滤xss的数据
*
* @return string 过滤后的数据
* @host https://www.73so.com
*/
function xss_filter($str)
{
if (empty($str)) return false;
$str = htmlspecialchars($str);
$str = str_replace( '/', "", $str);
$str = str_replace( '"', "", $str);
$str = str_replace( '(', "", $str);
$str = str_replace( ')', "", $str);
$str = str_replace( 'CR', "", $str);
$str = str_replace( 'ASCII', "", $str);
$str = str_replace( 'ASCII 0x0d', "", $str);
$str = str_replace( 'LF', "", $str);
$str = str_replace( 'ASCII 0x0a', "", $str);
$str = str_replace( ',', "", $str);
$str = str_replace( '%', "", $str);
$str = str_replace( ';', "", $str);
$str = str_replace( 'eval', "", $str);
$str = str_replace( 'open', "", $str);
$str = str_replace( 'sysopen', "", $str);
$str = str_replace( 'system', "", $str);
$str = str_replace( '$', "", $str);
$str = str_replace( "'", "", $str);
$str = str_replace( "'", "", $str);
$str = str_replace( 'ASCII 0x08', "", $str);
$str = str_replace( '"', "", $str);
$str = str_replace( '"', "", $str);
$str = str_replace("", "", $str);
$str = str_replace(">", "", $str);
$str = str_replace("<", "", $str);
$str = str_replace("<SCRIPT>", "", $str);
$str = str_replace("</SCRIPT>", "", $str);
$str = str_replace("<script>", "", $str);
$str = str_replace("</script>", "", $str);
$str = str_replace("select","",$str);
$str = str_replace("join","",$str);
$str = str_replace("union","",$str);
$str = str_replace("where","",$str);
$str = str_replace("insert","",$str);
$str = str_replace("delete","",$str);
$str = str_replace("update","",$str);
$str = str_replace("like","",$str);
$str = str_replace("drop","",$str);
$str = str_replace("DROP","",$str);
$str = str_replace("create","",$str);
$str = str_replace("modify","",$str);
$str = str_replace("rename","",$str);
$str = str_replace("alter","",$str);
$str = str_replace("cas","",$str);
$str = str_replace("&","",$str);
$str = str_replace(">","",$str);
$str = str_replace("<","",$str);
$str = str_replace(" ",chr(32),$str);
$str = str_replace(" ",chr(9),$str);
$str = str_replace(" ",chr(9),$str);
$str = str_replace("&",chr(34),$str);
$str = str_replace("'",chr(39),$str);
$str = str_replace("<br />",chr(13),$str);
$str = str_replace("''","'",$str);
$str = str_replace("css","'",$str);
$str = str_replace("CSS","'",$str);
$str = str_replace("<!--","",$str);
$str = str_replace("convert","",$str);
$str = str_replace("md5","",$str);
$str = str_replace("passwd","",$str);
$str = str_replace("password","",$str);
$str = str_replace("../","",$str);
$str = str_replace("./","",$str);
$str = str_replace("Array","",$str);
$str = str_replace("or 1='1'","",$str);
$str = str_replace(";set|set&set;","",$str);
$str = str_replace("`set|set&set`","",$str);
$str = str_replace("--","",$str);
$str = str_replace("OR","",$str);
$str = str_replace('"',"",$str);
$str = str_replace("*","",$str);
$str = str_replace("-","",$str);
$str = str_replace("+","",$str);
$str = str_replace("/","",$str);
$str = str_replace("=","",$str);
$str = str_replace("'/","",$str);
$str = str_replace("-- ","",$str);
$str = str_replace(" -- ","",$str);
$str = str_replace(" --","",$str);
$str = str_replace("(","",$str);
$str = str_replace(")","",$str);
$str = str_replace("{","",$str);
$str = str_replace("}","",$str);
$str = str_replace("-1","",$str);
$str = str_replace("1","",$str);
$str = str_replace(".","",$str);
$str = str_replace("response","",$str);
$str = str_replace("write","",$str);
$str = str_replace("|","",$str);
$str = str_replace("`","",$str);
$str = str_replace(";","",$str);
$str = str_replace("etc","",$str);
$str = str_replace("root","",$str);
$str = str_replace("//","",$str);
$str = str_replace("!=","",$str);
$str = str_replace("$","",$str);
$str = str_replace("&","",$str);
$str = str_replace("&&","",$str);
$str = str_replace("==","",$str);
$str = str_replace("#","",$str);
$str = str_replace("@","",$str);
$str = str_replace("mailto:","",$str);
$str = str_replace("CHAR","",$str);
$str = str_replace("char","",$str);
return $str;
}例2：看一个项中使用的php过滤xss的方法
if (!get_magic_quotes_gpc()) // 判断magic_quotes_gpc是否为打开
{
$str = addslashes($str); // magic_quotes_gpc没有打开的时候把数据过滤
}
$str = str_replace("_", "\_", $str); // 把 '_'过滤掉
$str = str_replace("%", "\%", $str); // 把' % '过滤掉
$str = nl2br($str); // 回车转换
$str = htmlspecialchars($str); // html标记转换
echo $str;例3：个人使用的一个php过滤xss的函数
/**
* 过滤参数
* @param string $str 接受的参数
* @return string
* @host https://www.73so.com
*/
function filterWords($str)
{
$farr = array(
"/<(\\/?)(script|i?frame|style|html|body|title|link|meta|object|\\?|\\%)([^>]*?)>/isU",
"/(<[^>]*)on[a-zA-Z]+\s*=([^>]*>)/isU",
"/select|insert|update|delete|\'|\/\*|\*|\.\.\/|\.\/|union|into|load_file|outfile|dump/is"
);
$str = preg_replace($farr,'',$str);
return $str;
}
/**
* 过滤接受的参数或者数组,如$_GET,$_POST
* @param array|string $arr 接受的参数或者数组
* @return array|string
* @host https://www.73so.com
*/
function filterArr($arr)
{
if(is_array($arr)){
foreach($arr as $k => $v){
$arr[$k] = filterWords($v);
}
}else{
$arr = filterWords($v);
}
return $arr;
}