Cacher is the code snippet organizer for pro developers

<?php
/**
 * Class Message
 */
abstract class Message
{

    protected $text;

    /**
     * Message constructor.
     * @param $text
     */
    public function __construct($text)
    {

        $this->text = $text;
    }

    /**
     * @return mixed
     */
    public function __toString()
    {

        return $this->text;
    }
}

/**
 * Class Sms
 */
class Sms extends Message
{

}

/**
 * Class SmsCollection
 */
class SmsCollection extends ArrayIterator
{

    /**
     * @param Sms $message
     */
    public function append(Sms $message)
    {

        parent::append($message);
    }

}

/**
 * Class SmsGateway
 */
class SmsGateway extends NoRewindIterator
{

}

// Generate random data
$smsCollection = new SmsCollection();
for ($i = 1; $i < 101; $i++) {
    $smsCollection->append(new Sms("Message ".$i));
}

$gateway = new SmsGateway($smsCollection);
echo $gateway->current(), PHP_EOL;
$gateway->next();
echo $gateway->current(), PHP_EOL;
$gateway->next();
echo $gateway->current(), PHP_EOL;
$gateway->rewind();
echo $gateway->current(), PHP_EOL;

// Output:
/*
  Message 1
  Message 2
  Message 3
  Message 3
*/