DI Example

di.php

<?php

class Foo extends Container {

    public function send_mail()
    {
        $transport = Swift_MailTransport::newInstance();
        $mailer = Swift_Mailer::newInstance($transport);

        $message = Swift_Message::newInstance('Wonderful Subject')
          ->setFrom(array('[email protected]' => 'John Doe'))
          ->setTo(array('[email protected]', '[email protected]' => 'A name'))
          ->setBody('Here is the message itself');

        return $mailer->send($message);
    }

}