PHP property inheritance?

Question

PHP

Good evening! At once I will make a reservation that I in OOP beginner. Faced such problem:
Class a

class a {<br/>
<br/>
var $boby;<br/>
<br/>
$b = new b();<br/>
<br/>
}<br/>

Class b inherited from a

class b extends a {<br/>
<br/>
$this-&gt;boby=&quot;Текст&quot;;<br/>
<br/>
}<br/>

I connect all this to the a.php file

&lt;?php<br/>
 $a= new a(); <br/>
?&gt;<br/>
<br/>
&lt;?php echo $a-&gt;body; ?&gt;<br/>
<br/>

If the property is set in class a, then it is displayed, and if it is defined in class b, then it is not displayed.
How to overcome this please tell me.

Answer 1

Does the parent class create within itself an object of the class that is its child? And is it okay?

Answer 2

So you create a class of type a, so if you create a class b, then it will be taken from your definition in it.

Answer 3

In an instance of class a and there is no value in the property body , but it is in the property b of class a .

class a
{
  var $body;
  var $b;

  function __construct()
  {
    $this->b = new b();
  }
}
class b extends a
{
  function __construct()
  {
    $this->body = 'text';
  }
}

$a = new a();

echo $a->b->body;