How reliable is php function get_browser?

StackOverflow https://stackoverflow.com/questions/6400305

Question

I am trying to find a good way to detect a visitor OS, browser, etc.

I found the PHP function get_browser

And I see that function can detect Java, I though the function used the user agent for detection, and I don't see any mention to Java on my VMs ua with java installed.

How does the function knows?

No correct solution

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