function hook_link_alter

hook_link_alter(&$variables)

Alter the parameters for links.

Parameters

array $variables: An associative array of variables defining a link. The link may be either a "route link" using \Drupal\Core\Utility\LinkGenerator::link(), which is exposed as the 'link_generator' service or a link generated by \Drupal\Core\Utility\LinkGeneratorInterface::generate(). If the link is a "route link", 'route_name' will be set; otherwise, 'path' will be set. The following keys can be altered:

• text: The link text for the anchor tag. If the hook implementation changes this text it needs to preserve the safeness of the original text. Using t() or \Drupal\Component\Utility\SafeMarkup::format() with @placeholder is recommended as this will escape the original text if necessary. If the resulting text is not marked safe it will be escaped.
• url_is_active: Whether or not the link points to the currently active URL.
• url: The \Drupal\Core\Url object.
• options: An associative array of additional options that will be passed to either \Drupal\Core\Utility\UnroutedUrlAssembler::assemble() or \Drupal\Core\Routing\UrlGenerator::generateFromRoute() to generate the href attribute for this link, and also used when generating the link. Defaults to an empty array. It may contain the following elements:
  • 'query': An array of query key/value-pairs (without any URL-encoding) to append to the URL.
  • absolute: Whether to force the output to be an absolute link (beginning with http:). Useful for links that will be displayed outside the site, such as in an RSS feed. Defaults to FALSE.
  • language: An optional language object. May affect the rendering of the anchor tag, such as by adding a language prefix to the path.
  • attributes: An associative array of HTML attributes to apply to the anchor tag. If element 'class' is included, it must be an array; 'title' must be a string; other elements are more flexible, as they just need to work as an argument for the constructor of the class Drupal\Core\Template\Attribute($options['attributes']).

See also

\Drupal\Core\Utility\UnroutedUrlAssembler::assemble()

\Drupal\Core\Routing\UrlGenerator::generateFromRoute()

Related topics

Hooks

Define functions that alter the behavior of Drupal core.

File

core/lib/Drupal/Core/Menu/menu.api.php, line 475

Hooks and documentation related to the menu system and links.

Code

function hook_link_alter(&$variables) {
  // Add a warning to the end of route links to the admin section.
  if (isset($variables['route_name']) && strpos($variables['route_name'], 'admin') !== FALSE) {
    $variables['text'] = t('@text (Warning!)', ['@text' => $variables['text']]);
  }
}