Mailer Symfony 2/3

Mailer.php

<?php

class Mailer
{
    /** @var \Swift_Mailer  */
    private $mailer;

    /** @var \Swift_Transport_AbstractSmtpTransport  */
    private $transport;

    /**
     * Mailer constructor.
     *
     * @param \Swift_Mailer                          $mailer
     * @param \Swift_Transport_AbstractSmtpTransport $transport
     */
    public function __construct(
        \Swift_Mailer $mailer,
        \Swift_Transport_AbstractSmtpTransport $transport
    ) {
        $this->mailer = $mailer;
        $this->transport = $transport;
    }

    /**
     * Create a email message.
     *
     * @param array     $recipients List of recipient with: to, cc, bcc key.
     * @param string    $subject    Subject of the email.
     * @param string    $htmlBody   Html content of the email.
     *
     * @return \Swift_Mime_SimpleMimeEntity
     */
    final public function createMessage(array $recipients, $subject, $htmlBody)
    {
        $message = \Swift_Message::newInstance()
            ->setSubject($subject)
            ->setFrom("[email protected]")
            ->setTo($recipients['to'])
            ->setCc($recipients['cc'])
            ->setBcc($recipients['bcc'])
            ->setContentType('text/html')
            ->setBody($htmlBody, 'text/html');

        return $message;
    }

    /**
     * Send an email message or a list of messages.
     *
     * @param mixed $messages A \Swift_Message or a list of \Swift_Message.
     */
    final public function sendAndFlush($messages)
    {
        if (is_array($messages) || $messages instanceof \Traversable) {
            foreach ($messages as $message) {
                $this->mailer->send($message);
            }
        } else {
            $this->mailer->send($messages);
        }

        $this->flush();
    }

    final public function flush()
    {
        // below to ensure mail is actualy sending
        $spool = $this->mailer->getTransport()->getSpool();
        $spool->flushQueue($this->transport);
    }
}