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it might not necessarily be an object. Its most likely an error in the writing of the code and the parse recognizes it as an object when its actually not
Actually returnParkingMapData() would return a PHP object that you use to interact with Java. Edit: I'm not trying to be a petty know-it-all. I just want to make sure you understand exactly what is going on.
If you want to know the type of variable, you can use gettype(). Perhaps a more useful function would be var_dump(), which dumps a bunch of different information about the variable.
Real programmers don't comment their code. If it was hard to write, it should be hard to understand.