Method __construct

/**
 * Constructor.
 *
 * @param   string   $uri       The URI to the linked resource.
 * @param   string   $relation  The relationship between the feed and the linked resource.
 * @param   string   $type      The resource type.
 * @param   string   $language  The language of the resource found at the given URI.
 * @param   string   $title     The title of the resource.
 * @param   integer  $length    The length of the resource in bytes.
 *
 * @since   3.1.4
 * @throws  \InvalidArgumentException
 */
public function __construct($uri = null, $relation = null, $type = null, $language = null, $title = null, $length = null)
{
    $this->uri = $uri;
    $this->relation = $relation;
    $this->type = $type;
    $this->language = $language;
    $this->title = $title;
    // Validate the length input.
    if (isset($length) && !is_numeric($length)) {
        throw new \InvalidArgumentException('Length must be numeric.');
    }
    $this->length = (int) $length;
}