PHP OOP pass variables to sub classes - php

Question

I am setting up variable values in a constructor function. To keep everything organised, I have created other classes which will only be instantiated once in the "application" class.
I want to pass protected variables value to other classes(frotend, backend ...). I know we can create same variables in these classes & pass variables as arguments. This will lead to a lot of code repetition.Is there any better way around?
Thanks
class application{
protected $name;
protected $version;
protected $slug;
public function __construct(){
$this->name = $name;
$this->version = $version;
$this->slug = $slug;
$this->includes();
}
public function create_settings(){
//Only one instantiation
$frontend = new Frontend_Settings();
$backend = new Backend_Settings;
//.. more like these
}
}
class Frontend_Settings{
public function __construct(){
print_r($name.$version.$slug);
}
}
class Backend_Settings{
public function __construct(){
print_r($name.$version.$slug);
}
}
$firstapp = new application( 'First app', '1.0', 'first-app');
$secondapp = new application( 'Second app', '1.0', 'second-app');

Answer 1

Off the top of my head...
<?php
class application{
protected $name;
protected $version;
protected $slug;
public function __construct(){
$this->name = $name;
$this->version = $version;
$this->slug = $slug;
// you might want traits instead?
$this->includes();
}
public function create_settings(){
//Only one instantiation
$frontend = new Frontend_Settings($this);
$backend = new Backend_Settings($this);
//.. more like these
}
public function name($name=null) {
if($name) {
$this->name = $name;
}
return $this->name;
}
public function version($version = null) {
if($version) {
$this->version = $version;
}
return $this->version;
}
public function slug($slug = null) {
if($slug) {
$this->slug = $slug;
}
return $this->slug;
}
}
class Frontend_Settings{
public function __construct($app){
$this->app = $app;
printf(
"%s.%s.%s",
$app->name(),
$app->version(),
$app->slug()
);
}
}
class Backend_Settings{
public function __construct($app){
$this->app = $app;
printf(
"%s.%s.%s",
$app->name(),
$app->version(),
$app->slug()
);
}
}
$firstapp = new application( 'First app', '1.0', 'first-app');
$secondapp = new application( 'Second app', '1.0', 'second-app');
Be aware, though, that if Frontend or Backend makes any changes to $app, that change will be passed by reference: i.e., if you change it in front end, it's changed in back end.