Shallow Clone

A shallow clone is an object cloning, where the cloned object keeps the same object properties as the original object. This is a fast way to share data between objects.

Shallow cloning is the default behavior in PHP.

<?php

class Dog {
    private $name = '';
    private Address $address;

    function __construct(string $name, Address $address) {
        $this->address->setName($address);
    }

    function moves(string $address) {
        $this->address->setName($address);
    }

    // no __clone method
}

$spike = new Dog('Spike', new Address('Acme city'));
$medor = clone $spike;
$medor->moves('Upstate farm');

// spike and medor are still at the same address

?>

Documentation

See also How to clone an object in PHP

Related : Magic Methods, __clone() Method, Deep Clone