PHP property as object

Question

Is it possible to set a property of a class as a object?

Like:

class User {

    public $x = \"\";
    public $y = new ErrorVO();
    public $w = new         


        

Answer 1

Yes, it is. But this can be done during the class instantiation (in the constructor) or later, for example:

• during instantiation:

  class A {
      public $a;
      public function __construct() {
          $this->$a = (object)array(
              'property' => 'test',
          );
      }
  }
  
  $my_object = new A();
  echo $my_object->a->property; // should show 'test'
  

• after instantiation:

  class B {
      public $b;
  }
  
  $my_object = new B();
  $my_object->b = (object)array(
      'property' => 'test',
  );
  echo $my_object->b->property; // should also show 'test'
  

You can not assign object directly in class definition outside constructor or other methods, because you can do it only with scalars (eg. integers, strings etc.).