Using PHP to determine if user is using a proxy in their browser

Is there a way to use PHP (or any other language) to determine if user is using a proxy in their browser.  I notice in my web server logs a handful of entries that say "using+proxy".  I'm not sure how it knows this.  But for a web site I am working on I need to know if the traffic is going straight to their browser or first going through a proxy that the user configured in their browser settings.
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