function hook_html_head_alter
hook_html_head_alter(&$head_elements)
Alter XHTML HEAD tags before they are rendered by drupal_get_html_head().
Elements available to be altered are only those added using drupal_add_html_head_link() or drupal_add_html_head(). CSS and JS files are handled using drupal_add_css() and drupal_add_js(), so the head links for those files will not appear in the $head_elements array.
Parameters
$head_elements: An array of renderable elements. Generally the values of the #attributes array will be the most likely target for changes.
Related topics
File
- modules/system/system.api.php, line 3903
- Hooks provided by Drupal core and the System module.
Code
function hook_html_head_alter(&$head_elements) { foreach ($head_elements as $key => $element) { if (isset($element['#attributes']['rel']) && $element['#attributes']['rel'] == 'canonical') { // I want a custom canonical URL. $head_elements[$key]['#attributes']['href'] = mymodule_canonical_url(); } } }
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https://api.drupal.org/api/drupal/modules!system!system.api.php/function/hook_html_head_alter/7.x