php判断xss攻击

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//判断是否是xss攻击
 
function _xss_check() {
  //urldecode解码已编码的URL 字符串
  //解码 过后的url串
  $temp = strtoupper(urldecode(urldecode($_SERVER['REQUEST_URI'])));
 
  if(strpos($temp, '<') !== false || strpos($temp, '"') !== false || strpos($temp, 'CONTENT-TRANSFER-ENCODING') !== false) {
    die('报告：xss攻击');
     }
  return true;
}