Method getOrientation

/**
 * Method to detect whether an image's orientation is landscape, portrait or square.
 *
 * The orientation will be returned as a string.
 *
 * @return  mixed   Orientation string or null.
 *
 * @since   3.4.2
 */
public function getOrientation()
{
    if ($this->isLoaded()) {
        return self::getOrientationString($this->getWidth(), $this->getHeight());
    }
    return null;
}