non-constructor-injection-example.php

<?php

class phone
{
    /**
     * @var string
     */
    private $brand = '';

    /**
     * @var string
     */
    private $model = '';

    /**
     * phone constructor.
     * @param $brand
     * @param $model
     *
     * Here we are creating the phone constructor and setting the params that the phone class will pass to
     * the user class.
     */
    public function __construct( $brand, $model )
    {
        $this->brand = $brand;

        $this->model = $model;
    }

    /**
     * @return string
     */
    public function getBrand()
    {
        return $this->brand;
    }

    /**
     * @return string
     */
    public function getModel()
    {
        return $this->model;
    }
}

class user
{
    /**
     * @var
     */
    private $userPhone;

    /**
     * @var string
     */
    private $userName = '';

    /**
     * user constructor.
     * @param $userName
     * @param $phoneBrand
     * @param $phoneModel
     *
     * In the user constructor we are creating a new instance of the phone object, setting the instance to the
     * userPhone variable, and passing the params into the constructor.
     */
    public function __construct( $userName, $phoneBrand, $phoneModel )
    {
        $this->userName = $userName;

        //setting userPhone to new instance of phone and passing in the params needed to create the object.
        $this->userPhone = new phone( $phoneBrand, $phoneModel );
    }
    
    public function getUserName()
    {
        return $this->userName;
    }

    public function getUserPhone()
    {
        return $this->userPhone;
    }

}

$user = new user( 'Kenny', 'HTC', 'One M8' );

echo '<pre>' . '<br>';

print_r( $user );

echo '<pre>';

****************************OUTPUT**********************************

user Object
(
    [userPhone:user:private] => phone Object
        (
            [brand:phone:private] => HTC
            [model:phone:private] => One M8
        )

    [userName:user:private] => Kenny
)