SAP keeps popping up on the PHPradar more and more these days, and this new article from the ITtoolbox site blog explains the situation from a PHP developer's point of view in a SAP-using company (and a few tips to get you started).
So you're a PHP developer and your company is running SAP, the problem though is you have no clue about SAP or what it does - you are curious though. The following are a few tips on making the cross over from building web applications to building SAP based web applications using PHP.
They start with the obvious, finding out what version you're working with, before moving on to the actual development. They link to a few resources for tools to help you make the connections and functionality inside the SAP systems. The simple script they give to test things out just logs you into the system and displays a status for your connection - nice and easy.