Trait for defaults and settings

gistfile1.php

<?php
trait StaticDefaults{
  protected static $_defaults = [];
  
  public function __get($key){
    if(is_callable($func = self::$_defaults[$key])) return $func();
    return $func;
  }
  
  static public function defaults($defaults){
    self::$_defaults += $defaults;
  }
}

trait ArrayConstruct{
  public function __construct($s = []){
    foreach($s as $k => $v) $this->$k = $v;
  }
}

abstract class Model{
  use StaticDefaults, ArrayConstruct;
}

class ExampleModel extends Model {

}

class Application{
  function __construct(){
    $this->configure();
  }

  public function configure(){
    Model::defaults(["db"=>["host"=>"127.0.0.1", "username"=>"user", "password"=>"pass"]]);
  }

  public function run(){
    $model = new ExampleModel; //default db
    print_r($model->db);
    $model2 = new ExampleModel(["db"=>["host"=>"8.8.8.8", "username"=>"google", "password"=>"dns"]]); //overriden db
    print_r($model2->db);
  }
}

$app = new Application;
$app->run();