PHP Class as a Parameter of another class - php

Question

I'm sorry for what is probably an easy question, but I'm having trouble finding anything about it on the web. I have two classes, for the purposes of this post let's call them user and address, looking like this:
class user {
public $firstName;
public $lastName;
public $address;
}
class address{
public $streetAddress;
public $streetName;
public $city;
public $state;
public $zip;
}
In this case, I want the $address parameter in the user class to be of type "address" defined by the second class. Can I do this in PHP? My end goal is to be able to consume properties like this:
$userZip = $user->address->zip;
Am I on the right track or way off?

Answer 1

Try like this;
<?php
class user {
public $firstName='bulent';
public $lastName ='kocaman';
public $address;
public function __construct()
{
$this->address = new address();
}
}
class address{
public $streetAddress=1;
public $streetName=2;
public $city=3;
public $state=4;
public $zip=5;
}
$user = new user();
print_r($user->address->zip);
?>
or
<?php
class user extends address{
public $firstName='bulent';
public $lastName ='kocaman';
}
class address{
public $streetAddress=1;
public $streetName=2;
public $city=3;
public $state=4;
public $zip=5;
}
$user = new user();
print_r($user->zip);
?>

Answer 2

$address = new $address();
I believe this is what you're looking for.
In PHP variable types are defined by the data they are assigned to. If you want $address in class 1 to be of type $address (class 2) then all you have to do is assign it to an instance of $address and it will take on that type. You will then be able to access any of the $address properties by using:
$user->address->zip
In short, yes you are on the right track. Look into adding constructors to your classes.