public function CacheExampleForm::expireFiles in Examples for Developers 8

Same name and namespace in other branches

1. 3.x modules/cache_example/src/Form/CacheExampleForm.php \Drupal\cache_example\Form\CacheExampleForm::expireFiles()

Submit handler that explicitly clears cache_example_files_count from cache.

File

cache_example/src/Form/CacheExampleForm.php, line 217

Class

CacheExampleForm

Form with examples on how to use cache.

Namespace

Drupal\cache_example\Form

Code

public function expireFiles($form, &$form_state) {

  // Clear cached data. This function will delete cached object from cache
  // bin.
  //
  // The first argument is cache id to be deleted. Since we've provided it
  // explicitly, it will be removed whether or not it has an associated
  // expiration time. The second argument (required here) is the cache bin.
  // Using cache_clear_all() explicitly in this way
  // forces removal of the cached item.
  $this->cacheBackend
    ->delete('cache_example_files_count');

  // Display message to the user.
  $this
    ->messenger()
    ->addMessage($this
    ->t('Cached data key "cache_example_files_count" was cleared.'), 'status');
}