How to pass parameters from one property-object to another property-object?

Question

PHP

There is an object which has two properties - objects.
Is it possible to access from one property-object to another property-object. For example, in setPage() you need to get data from the property object $site->db;

<?php
 class page{
    public $path;
    public $code;
    function setPath($path){
        /*Здесь нужно получить доступ к методу getName объекта $site->db */
        $this->path=$path;    
    }
    function getPath(){
        $ret=$this->path;
        return $ret;    
    }
 }
 class db{
    public $name;
    function setName($name){
        $this->name=$name;
    }
    function getName(){
        return $this->name;
    }
 }
 class site {
    public $server;
    public $db;
    public $page;
    function dbInit(){
        $this->db= new db();
        $this->db->setName('local');
    }
    function getPage(){
        $this->page=new page();        
        $this->page->setPath('user/profile');
        echo $this->page->getPath();
    }
 }
 $site=new site();
 $site->dbInit();
 $site->getPage();

So far the only solution is to pass as a parameter. Well, respectively, add a constructor, etc. But if there are several such properties-objects, then what is the only way? Transfer all objects manually? Is it really any other way?
$this->page=new page($this->$db);

Answer 1

It is not very clear how this differs from the situation when the objects are not properties of the same class. In my opinion, there is no difference. So yes - transfer all objects "manually". Good old dependency injection
And if there are several such properties-objects, then perhaps reconsider the structure of classes or how they are created. Enable factory or container