有没有办法从声明类中的素数类中获取变量？

Question

for example -

class wow
{
  public $foo = 5;
  public function __construct()
 {
   $sub_class = new sub();
 }

}

    class sub
{
  public function __construct()
  {
    echo $this->foo;
  }
}

$wow = new wow();

Is there a way of doing this?

why the f*** always people minusing my questions? What is your problem? This site is for asking questions, if you have a problem so don't come to this site.

Answer 1

Adding on from my comment.. try this

class wow
{
    public $foo = 5;
    public function __construct()
    {
        $sub_class = new sub();
    }
}

class sub extends wow
{
    public function __construct()
    {
        echo $this->foo;
    }
}

$wow = new wow();