hook_entity_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface$display, $view_mode)
Act on entities being assembled before rendering.
&$build: A renderable array representing the entity content. The module may add elements to $build prior to rendering. The structure of $build is a renderable array as expected by drupal_render().
\Drupal\Core\Entity\EntityInterface $entity: The entity object.
\Drupal\Core\Entity\Display\EntityViewDisplayInterface $display: The entity view display holding the display options configured for the entity components.
$view_mode: The view mode the entity is rendered in.
function hook_entity_view(array &$build, \Drupal\Core\Entity\EntityInterface $entity, \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display, $view_mode) { // Only do the extra work if the component is configured to be displayed. // This assumes a 'mymodule_addition' extra field has been defined for the // entity bundle in hook_entity_extra_field_info(). if ($display->getComponent('mymodule_addition')) { $build['mymodule_addition'] = array( '#markup' => mymodule_addition($entity), '#theme' => 'mymodule_my_additional_field', ); } }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Entity!entity.api.php/function/hook_entity_view/8.1.x