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motivation.md

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The motivation

I inherited a project running on PHP 5.5.x containing undocumented code dealing with SAP remote function calls. As a way to connect, Eduard Kouckys SAPRFC module had been used. In order to switch to a more current PHP version, I had to rewrite the PHP code and replace the PHP module too. The question was: How can I be sure, that the code of this project dealing with SAP remote function calls will not be the source of errors?

That lead to the following requirements:

  1. Any code dealing with the actual PHP module has to be simple in order to reduce the risk of errors.
  2. The code in my project dealing with SAP remote function calls has to work for several PHP modules and it still has to work, in case of a switch to a different way of communicating with SAP.
  3. The configuration has to be as interchangeable as possible between the PHP modules.