trait test

traits.php

<?php

abstract class BaseUser
{
    protected $id;

    public function getId()
    {
        return $this->id;
    }
}

trait UserExtension1
{
    protected $username;

    public function getUsername()
    {
        return $this->username;
    }

    public function setUsername($username)
    {
        $this->username = $username;
        return $this;
    }
}

trait UserExtension2
{
    protected $password;

    public function getPassword()
    {
        return $this->password;
    }

    public function setPassword($password)
    {
        $this->password = md5($password);
        return $this;
    }
}

class User extends BaseUser
{
    use UserExtension1;
    use UserExtension2;
}

$user = new User();
$user->setUsername('filip.janecek');
$user->setPassword('zasZas-asd');

printdata($user);

function printdata($data)
{
    echo '<pre>';
    print_r($data);
    echo '</pre>';
}