Access property of another object in a class - PHP

Question

I have been looking hard for a solution on this and i can't solve it so i will ask my question here and hopefully it will help others searching for the same question.

I have a Class for an items based on "Armor" for example.

class Armor {
    public $name, $defense, $durability;
       function __construct($name, $defense, $durability){
       $this->name = $name;
       $this->defense = $defense;
       $this->durability = $durability;
   }
}

Then i create a bunch of objects like this:

$heavy_armor = new Armor("Heavy Armor", 250, 50);

Then in a totally different file and use, I have another class for Magic Items which will create a brand new Magic Item but the base i want to use is the already existing heavy armor. However, there is a catch. I am already extending a different MagicArmors class because i will be creating a lot of these new classes and i want the common properties that will be the same across all Magic Armors to stay in one place - the MagicArmors class. Example:

class MagicHeavyArmor extends MagicArmors {
    public function __construct() {
        $this->name = "Magic Heavy Armor";
// so here i want to point to the Defense and Durability of the $heavy_armor object
        $this->defense = 625; // Ideally i want $this->defense = $heavy_armor->defense * 2.5
        $this->durability = 87.5; // Same here - I want $this->durability = $heavy_armor->durability * 1.75
    }

So how do I make this work? The reason is that i will be creating a huge load of these and i want all of them to be able to looking for their base properties from other objects. And if i need to change a value of a property, to ease my life later.

Answer 1

The constructor should take the previous armor as a parameter, and can refer to its properties.

    public function __construct($armor) {
        $this->name = "Magic " . $armor->name;
        $this->defense = $armor->defense * 2;
        $this->durability = $armor->durability * 1.75;
    }

Then you create the object like this:

new MagicHeavyArmor($heavy_armor);