Question

Basically, I want to inform a C++ application (a game application) when an event occurs in my PHP page.

Below is an example:

• User logs in to website and purchases something.
• PHP validates this transaction and returns a JSON/XML object to C++ application.
• C++ application receives transactionID and gives user the item he bought.

Right now I do this in a bad way. PHP writes to database, C++ application constantly reads the database, causing a performance loss.

How can I archieve this?

Answer 1

Use ZeroMQ supports both PHP and C++;

Simple hello World Example

//
//  Hello World server in C++
//  Binds REP socket to tcp://*:5555
//  Expects "Hello" from client, replies with "World"
//
#include <zmq.hpp>
#include <string>
#include <iostream>
#include <unistd.h>

int main () {
    //  Prepare our context and socket
    zmq::context_t context (1);
    zmq::socket_t socket (context, ZMQ_REP);
    socket.bind ("tcp://*:5555");

    while (true) {
        zmq::message_t request;

        //  Wait for next request from client
        socket.recv (&request);
        std::cout << "Received Hello" << std::endl;

        //  Do some 'work'
        sleep (1);

        //  Send reply back to client
        zmq::message_t reply (5);
        memcpy ((void *) reply.data (), "World", 5);
        socket.send (reply);
    }
    return 0;
}

PHP

$context = new ZMQContext();
$requester = new ZMQSocket($context, ZMQ::SOCKET_REQ);
$requester->connect("tcp://localhost:5555");

//Send Simple Request
$requester->send("Hello");

//Get Response Form C++
printf("Received reply %s", $requester->recv());