PHP OOP 将变量传递给子类

Question

我在构造函数中设置变量值。
为了保持一切井井有条，我创建了其他类，它们只会在“应用程序”类中实例化一次。
我想将受保护的变量值传递给其他类（前端，后端......）。我知道我们可以在这些类中创建相同的变量并将变量作为参数传递。这会导致大量的代码重复。
有没有更好的办法？
谢谢

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

在我的头顶...

<?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');

但请注意，如果 Frontend 或 Backend 对 $app 进行任何更改，该更改将通过引用传递：即，如果您在前端更改它，它会在后端更改。