protected function HtmlResponseAttachmentsProcessor::processHtmlHeadLink

protected HtmlResponseAttachmentsProcessor::processHtmlHeadLink(array $html_head_link)

Transform a html_head_link array into html_head and http_header arrays.

html_head_link is a special case of html_head which can be present as a link item in the HTML head section, and also as a Link: HTTP header, depending on options in the render array. Processing it can add to both the html_head and http_header sections.

Parameters

array $html_head_link: The 'html_head_link' value of a render array. Each head link is specified by a two-element array:

• An array specifying the attributes of the link.
• A boolean specifying whether the link should also be a Link: HTTP header.

Return value

array An ['#attached'] section of a render array. This allows us to easily merge the results with other render arrays. The array could contain the following keys:

• http_header
• html_head

File

core/lib/Drupal/Core/Render/HtmlResponseAttachmentsProcessor.php, line 406

Class

HtmlResponseAttachmentsProcessor

Processes attachments of HTML responses.

Namespace

Drupal\Core\Render

Code

protected function processHtmlHeadLink(array $html_head_link) {
  $attached = [];

  foreach ($html_head_link as $item) {
    $attributes = $item[0];
    $should_add_header = isset($item[1]) ? $item[1] : FALSE;

    $element = array(
      '#tag' => 'link',
      '#attributes' => $attributes,
    );
    $href = $attributes['href'];
    $attached['html_head'][] = [$element, 'html_head_link:' . $attributes['rel'] . ':' . $href];

    if ($should_add_header) {
      // Also add a HTTP header "Link:".
      $href = '<' . Html::escape($attributes['href'] . '>');
      unset($attributes['href']);
      $attached['http_header'][] = ['Link', $href . drupal_http_header_attributes($attributes), TRUE];
    }
  }
  return $attached;
}