trait example

gistfile1.php

<?php

trait CreatedTrait
{
    /**
     * @var DateTime
     */
    protected $created;

    /**
     * @return DateTime
     */
    public function getCreated()
    {
        return $this->created;
    }

    /**
     * @param DateTime $created
     */
    public function setCreated($created)
    {
        $this->created = $created;
    }
}

class User
{
    use CreatedTrait;
}

class Article
{
    use CreatedTrait;
}

$user = new User();
$user->setCreated(new DateTime());

$article = new Article();
$article->setCreated(new \DateTime());

echo sprintf(
    "User created %s, article created %s",
    $user->getCreated()->format('d.m.Y'),
    $article->getCreated()->format('d.m.Y')
);

?>