Changing node.js server to Apache server

I was working with react-webpackage and running the project into node.js Now due to demand , i have to add some php files in the project but i don't know how to add php file in my project and now transfer my project from node.js to Xampp and run my project with xampp... can you please guide me with that.

I am using this webpack "https://github.com/srn/react-webpack-boilerplate".

And my webpack index.js file looks like this.

   'use strict';

   var fs = require('fs');
   var path = require('path');

   var express = require('express');
   var app = express();

  var compress = require('compression');
  var layouts = require('express-ejs-layouts');

  app.set('layout');
  app.set('view engine', 'ejs');
  app.set('view options', {layout: 'layout'});
  app.set('views', path.join(process.cwd(), '/server/views'));

  app.use(compress());
  app.use(layouts);
  app.use('/client', express.static(path.join(process.cwd(), '/client')));

   app.disable('x-powered-by');

   var env = {
    production: process.env.NODE_ENV === 'production'
   };

  if (env.production) {
 Object.assign(env, {
   assets: JSON.parse(fs.readFileSync(path.join(process.cwd(), 'assets.json')))
  });
 }



  app.get('/*', function(req, res) {
  res.render('layout', {
   env: env
 });
});

 var port = Number(process.env.PORT || 3001);
 app.listen(port, function () {
 console.log('server running at localhost:3001, go refresh and see magic');
 });

if (env.production === false) {
  var webpack = require('webpack');
  var WebpackDevServer = require('webpack-dev-server');

  var webpackDevConfig = require('./webpack.config.development');

   new WebpackDevServer(webpack(webpackDevConfig), {
    publicPath: '/client/',
  contentBase: './client/',
   inline: true,
  hot: true,
   stats: false,
   historyApiFallback: true,
   headers: {
  'Access-Control-Allow-Origin': 'http://localhost:3001',
  'Access-Control-Allow-Headers': 'X-Requested-With'
   }
  }).listen(3000, 'localhost', function (err) {
  if (err) {
     console.log(err);
   }

   console.log('webpack dev server listening on localhost:3000');
   });
  }

basically i want to declare some variables in php and fetch them to javascript.so just want to add one file in webpack(file named as index.php) and then all my project work normally

Thanks.