$what=$_POST['what']; //post提交数据 echo $what; if($what=='flag') echo 'flag{****}';
源码如上，我们只需要post提交变量what=flag就欧克,使用插件HackBar提交
$what=$_POST['what']; echo $what; if($what=='flag') echo 'flag{****}'; flagflag{bugku_get_ssseint67se}
得到flag
