PHP's filter_input() strips $_SERVER data on external host, but works on localhost

Question

I am running an apache2 server where I do my localhost testing (PHP 5.5), but my hosting provider has PHP 5.3. I don\'t know whether that is an issue, but I mention it just

Answer 1

I had the same problem, I won't be able to tell you why it returns an empty string/FALSE but for me using INPUT_ENV instead of INPUT_SERVER did work and returns the same IP-address as $_SERVER['REMOTE_ADDR']. Same goes for HTTP_USER_AGENT. Short example:

$REMOTE_ADDR = filter_input(INPUT_ENV, 'REMOTE_ADDR', FILTER_VALIDATE_IP);

Answer 2

My guess would be something related to this bug: https://github.com/wp-stream/stream/issues/254

Try to use the bugfix on your code as a workaround