function drupal_add_html_head_link in Drupal 7

Adds a LINK tag with a distinct 'rel' attribute to the page's HEAD.

This function can be called as long the HTML header hasn't been sent, which on normal pages is up through the preprocess step of theme('html'). Adding a link will overwrite a prior link with the exact same 'rel' and 'href' attributes.

Parameters

$attributes: Associative array of element attributes including 'href' and 'rel'.

$header: Optional flag to determine if a HTTP 'Link:' header should be sent.

8 calls to drupal_add_html_head_link()

drupal_add_feed in includes/common.inc

Adds a feed URL for the current page.

node_page_view in modules/node/node.module

Menu callback: Displays a single node.

openid_test_html_openid1 in modules/openid/tests/openid_test.module

Menu callback; regular HTML page with OpenID 1.0 <link> element.

openid_test_html_openid2 in modules/openid/tests/openid_test.module

Menu callback; regular HTML page with OpenID 2.0 <link> element.

taxonomy_term_page in modules/taxonomy/taxonomy.pages.inc

Menu callback; displays all nodes associated with a term.

... See full list

File

includes/common.inc, line 2959

Common functions that many Drupal modules will need to reference.

Code

function drupal_add_html_head_link($attributes, $header = FALSE) {
  $element = array(
    '#tag' => 'link',
    '#attributes' => $attributes,
  );
  $href = $attributes['href'];
  if ($header) {

    // Also add a HTTP header "Link:".
    $href = '<' . check_plain($attributes['href']) . '>;';
    unset($attributes['href']);
    $element['#attached']['drupal_add_http_header'][] = array(
      'Link',
      $href . drupal_http_header_attributes($attributes),
      TRUE,
    );
  }
  drupal_add_html_head($element, 'drupal_add_html_head_link:' . $attributes['rel'] . ':' . $href);
}