Padrão de Estratégia (PHP)

/**
 * ImportInterface
 */
interface ImportInterface
{

    /**
     * Get content
     *
     * @return string content
     */
    public function getContent();
}

/**
 * ImportOne
 */
class ImportOne implements ImportInterface
{
    use ImportHelper;

    /**
     * @var string params
     */
    const CONTENT_TYPE = '#1';

    /**
     * @return string
     */
    public function getContent()
    {
        return $this->import(self::CONTENT_TYPE);
    }
}

/**
 * ImportTwo
 */
class ImportTwo implements ImportInterface
{
    use ImportHelper;

    /**
     * @var string
     */
    const CONTENT_TYPE = '#2';

    /**
     * @return string основной контент
     */
    public function getContent()
    {
        return $this->import(self::CONTENT_TYPE);
    }
}

/**
 * ImportClient
 */
class ImportClient
{

    /**
     * @var ImportInterface
     */
    private $importType;

    /**
     * @param ImportInterface $importType            
     */
    public function setType(ImportInterface $importType)
    {
        $this->importType = $importType;
    }

    /**
     * @return string
     */
    public function getContent()
    {
        return $this->importType->getContent();
    }
}

/**
 * ImportHelper
 */
trait ImportHelper
{

    /**
     * @param string $query            
     * @return string
     */
    public function import($query = 'name')
    {
        return $query;
    }
}

/**
 * Use
 */
$client = new ImportClient();

foreach (['ImportOne', 'ImportTwo'] as $type) {
    $client->setType(new $type());
    var_dump($client->getContent());
}