Finding out which version PHP a remote server is running
<p>I can't imagine this is possible but maybe there's some novel way. I'm developing an app which will require a few php files to be deployed and run on the clients' webservers. I'm not particularly interested in targeting clients who are still running pre version 5 versions of PHP.</p>

<p>So is there any way one can tell which version of PHP a remote webserver has running?</p>
