Convert clieop03 class into XML-ISO20022

We currently use a PHP class that creates a direct debit file according to the clieop03 standard. It does this based on our input which currently includes the following: bank account number, bank holder, city, total amount and our own account number. XML-ISO20022 requires more information but we will supply this where necessary from our own code. The class currently uses a loop that goes through an array of data (this data is what we supply and includes all the necessary information). Within this loop there are function calls to that class that temporarily stores the data. A writeClieop() file bundles the result of this data into a file usable by our banks. The class can be written with an example which we will then implement into our systems. We're looking for similar functionality in the new class.