public EntityInterface::link($text = NULL, $rel = 'canonical', array $options = [])
Deprecated way of generating a link to the entity. See toLink().
string|null $text: (optional) The link text for the anchor tag as a translated string. If NULL, it will use the entity's label. Defaults to NULL.
string $rel: (optional) The link relationship type. Defaults to 'canonical'.
array $options: See \Drupal\Core\Routing\UrlGeneratorInterface::generateFromRoute() for the available options.
string An HTML string containing a link to the entity.
Overrides EntityInterface::link
\Drupal\Core\Entity\EntityInterface::toLink
public function link($text = NULL, $rel = 'canonical', array $options = []);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!EntityInterface.php/function/EntityInterface::link/8.1.x