Integrating Gulp and bower into Zend Project - php

Question

The issue is, I would like to use all benefits of tasks runner and bower into my existing Zend-Project. I'm not sure, how should I restructure my whole project folder.
My current structure looks like follows:
config
module
vendor
public
css
js
libs
jquery
bootstrap
controller1
jsController1.
etc
index.php
From this (Gulp and Bower - creating proper files structure) I know, that I have to create a separate folder to save all libraries installed from bower and then I have to copy them with gulp into the public folder. Now depending on enviroment (Production or Development) I want to use minified css and js scripts. So should I create 2 public - folders and depending on enviroment change base path for zend? Or what's the best way to perform that?
Additionally I would like to integrate browser-sync into this project (cause of livereload). Therefore I want to use gulp-connect to start the php-server. But then the enviroment variables from apache are not set. How can I set it? According to documentation I have to add newArgs (cause my Options are array) "APPLICATION_ENV=development". But if add this after comma, i get error: "Could not open input file: APPLICATION_ENV=development"
My currenty gulfile:
var gulp = require('gulp'),
php = require('gulp-connect-php');
gulp.task('php', function() {
php.server({
configCallback: function _configCallback(type, collection) {
// If you wish to leave one of the argument types alone, simply return the passed in collection.
if (type === php.OPTIONS_SPAWN_OBJ) { // As the constant suggests, collection is an Object.
// Lets add a custom env var. Good for injecting AWS_RDS config variables.
collection.env = Object.assign({
APPLICATION_ENV: "development"
}, process.env);
return collection;
} else if (type === php.OPTIONS_PHP_CLI_ARR) { // As the constant suggests, collection is an Array.
let newArgs = [
'-e', // Generate extended information for debugger/profiler.
'-d', 'memory_limit=2G' // Define INI entry, Up memory limit to 2G.
,"APPLICATION_ENV=development"
];
// Ensure our argument switches appear before the rest.
return newArgs.concat(collection);
}
}
,
base: 'public',
port: 8010,
keepalive: true},
function _connected_callback() {
console.log("PHP Development Server Connected.");
});
}
);