How do you know all the methods on the COM class in PHP?

How do you know all the methods under the COM class in PHP??
$word = new COM ("Word.Application") or Die ("Unable to instanciate word");
$word->visible = 1;
$word->documents->add ();
$word->selection->typetext ("This is a test ...");
$word->documents[1]->saveas ("Useless test.doc");


For example, the above code visible,documents,selection, these methods (I am a novice, do not know this expression is right), I want to know this class below all the methods, how to get it? Like the array that directly printed out, there is a way

------Solution--------------------
Com_print_typeinfo

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