connect.static() interpret PHP files with node.js and connect

I successfully configured node with connect and nowjs. Calling localhost:8001/test.html and localhost:8001/chat.html works without any problems. But when calling a PHP-file localhost:8001/test.php my browser wants me to download that file. Obviously connect.static won't interpret the PHP file. Is there any other possibility to get it work for html and php files? Thanks

 var http = require('http');
    var connect = require('connect');
    var nowjs = require("now");
    var app = connect();

    app.use(connect.static('/var/www/www.domain.com/htdocs'));
    app.use(function(req, res){
        res.end();
    });


    var server = http.createServer(app).listen(8001); 
    var everyone = nowjs.initialize(server);