I don't see PHP going anywhere, anytime soon. PHP has made some great strides. PHP 5.4 made a huge stride IMO with a built in web server (http://php.net/manual/en/features.commandline.webserver.php) I have not used this feature yet, but with one command, you can initiate a listener on a custom port to test your scripts. It does not have MySQL ported with it, which is perfectly fine with me since I will just set up a dev db along side my production one.
Just looking at the version log, you can see the strides it has made lately, and how often. It is a very lively project.