Possible duplicate:
What is the deal with leading underscores in PHP class methods?
I think this is pretty descriptive ... what does it mean if you see a function starting with underscore in php? I have seen this many times, and I still don’t know what it is! It still works, but it looks weird, starting with an underscore, and I suspect it's just an agreement, but I don't know what it is. I'm not talking about double underlined functions (i.e. __construct ()), but in one underscore.
My best guess is that it means your own unique function, and you want others to know about it?
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