File Decoding Specialist Needed

I want to decode a file that is encoded with this summary example (the php file has 45 lines of code)


if(!call_user_func(base64_decode('ZnVuY3Rpb25fZXhpc3Rz'), base64_decode('Zm5fc2ltcGxlX2RlY').base64_decode('29kZV9zdHI='))){require_once(DIR_ROOT.'/app/schemas/litera l_converter/utf8.functions.php');}$_6rAcCWl81Q=call_user_func(base64_decode('Zm5fc2ltcGxlX2RlY29kZV9zdHI='), 'go`tjnqmf`efdpef`tus');$_1umu_qOz_E=call_user_func(base64_decode('Zm5fc2ltcGxlX2RlY29kZV9zdHI='), 'go`tjnqmf`fodpef`tus');$MY7uJAkg8Y=call_user_func(base64_decode('Zm5fc2ltcGxlX2RlY29kZV9zdHI='), 'cbtf75`efdpef');
function fn_netopia_add_payment_processor(){$_6rAcCWl81Q=call_user_func(base64_decode('Zm5fc2ltcGxlX2RlY29kZV9zdHI='), 'go`tjnqmf`efdpef`tus');$_1umu_qOz_E=call_user_func(base64_decode('Zm5fc2ltcGxlX2RlY29kZV9zdHI='), 'go`tjnqmf`fodpef`tus');$MY7uJAkg8Y=call_user_func(base64_decode('Zm5fc2ltcGxlX2RlY29kZV9zdHI='), 'cbtf75`efdpef');db_query
(
$_6rAcCWl81Q($MY7uJAkg8Y("Sk9URlNVIUpPVVAhQDtxYnpuZm91YHFzcGRmdHRwc3QhQGY=")),
[
$_6rAcCWl81Q($MY7uJAkg8Y("cXNwZGZ0dHBz")) => $_6rAcCWl81Q($MY7uJAkg8Y("T2Z1cHFqYiFRYnpuZm91dA==")),
$_6rAcCWl81Q($MY7uJAkg8Y("cXNwZGZ0dHBzYHRkc2pxdQ==")) => $_6rAcCWl81Q($MY7uJAkg8Y("b2Z1cHFqYi9xaXE=")),