如何打印/回顯此代碼中所有 Country 對象的所有屬性/屬性值？我想使用'foreach'，但我不知道sintaxis。echo 語句位于最后一行代碼中。謝謝！    <?php   class Country {  public $nombre;  public $poblacion;  public $idioma;  public $moneda;  public $economia;  public $deporte;}$country1 = new Country ();$country1->nombre = 'Argentina';$country1->poblacion = '40 millones';$country1->idioma = 'Castellano';$country1->moneda = 'Peso argentino';$country1->economia = 'Agro';$country1->deporte = 'Futbol';$country2 = new Country ();$country2->nombre = 'USA';$country2->poblacion = '200 millones';$country2->idioma = 'Ingles';$country2->moneda = 'Dolar estadounidense';$country2->economia = 'Multiples industrias';$country2->deporte = 'Basket,Baseball,Futbol Americano';$country3 = new Country ();$country3->nombre = 'Alemania';$country3->poblacion = '50 millones';$country3->idioma = 'Aleman';$country3->moneda = 'Euro';$country3->economia = 'Multiples industrias';$country3->deporte = 'Futbol';$countries = [$country1,$country2,$country3];foreach ($countries as $country){  **echo $country->?? "<br>";**}