ademar26

class A 
{
  function func1() {
    //some stuff
    return $this;
  }

  function func2() {
    //some stuff
    return $this;
  }
}

$a = new A();
$a->func1()->func2();

var cities = {
      bra: ["Сан-Паулу", "Рио-де-Жанейро"],
      rus: ["Москва", "Санкт-Петербург"],
      ind: ["Мумбаи", "Дели"],
      chn: ["Шанхай", "Пекин"],
      zaf: ["Йоханнесбург", "Кейптаун"]

    };

    var country = document.getElementById("country");
    var city = document.querySelector("#city");

    window.onload = selectCountry(city, cities);
    country.onchange = function() {
      selectCountry(city, cities);
    }

    function selectCountry(city, ev) {
      city.innerHTML = "";
      var c = country.value || "bra",
        o;
      for (let i = 0; i < ev[c].length; i++) {
        o = new Option(ev[c][i], ev[c][i], false, false);
        city.add(o);
      };
    }