class Employee {
  public function getName() {}
  public function getSalary() {}
}

/**
 * @return Employee[]
 */
function listOfEmployees() {
  //...
}

$a = listOfEmployees();
$a[0]->

/**
 * Employee
 * 
 * @property string name
 * @property string salary
 * @property Employee[] coWorkers
 */
class Employee {
  function __get($name) {
    //...
  }
}

/**
 * @return Employee
 */
function getEmployee(/*...*/) {
  //...
}

$a = getEmployee();
$a->coWorkers[0]->