Someone could tell me what kind of encrypt is it?

Well i got a php code encrypted, i thought it could be zend guard encrypt but it is not.

I post it in this link: http://pastebin.com/NxqmC4ku

I don't know if it possible to know.

Thanks.

Oh dear, looks like your server got hacked. The code will decode and execute itself when run, it's obfuscated to obscure its function.

It's self-decoding. You can see the eval() in there. If you change it to a print() then it will display the code that it's trying to execute. This is nested several deeps, so each time you will need to change an eval() to a print() to see what's going on. Be very careful when doing this, every time you see a construct like $a($b) then it's doing a function call, so you'll need to stop it from doing the function call and just print out $a and $b.