Can't interpret this PHP error log message

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I keep getting this message (and nothing else) in the PHP error log, and have no idea how to find out what it means:

[:error] [pid 491] [client] , referer:

The first IP address is the machine running the browser, the second one is the server (a Raspberry Pi). None of my other log messages are appearing. page1.html is a small page with a bit of JavaScript.

What does this mean? Any clues where to start looking?

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1 Answer


What you are displaying to us is an Apache Error log.

Apache runs PHP. This is NOT a PHP error.

Explore what process has pid 491 .

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