post request from PHP to node.js(socket.io)

Is it possible to make a POST request from "php" to "node.js+socket.io" and calling the appropriate method?

Code of server:

var io = require('socket.io').listen(8080);

io.sockets.on('connection', function (socket) {

    socket.on('test', function (data) {
        console.log(data);
    });

    socket.on('disconnect', function () {
        console.log(socket.id);
    });

});

How to call the method "test" from php?