<?php 
header("content-type:text/html;charset=utf8");
highlight_file(__FILE__);
for ($i=1; $i<=10 ; $i++) { 
    file_put_contents($i.'.txt', "$i-flag:www.bihuo.cn");
}

 ?>
Warning: file_put_contents(1.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(2.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(3.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(4.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(5.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(6.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(7.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(8.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(9.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5

Warning: file_put_contents(10.txt): failed to open stream: Permission denied in /home/wwwroot/www.nanhack.com/payload/unserilization/submit/createfile.php on line 5