How do I retrieve the query parameters from a path?

Question

How do I retrieve the query parameters from a path. Here's my path:

/search?keys=hello

Here is what I've tried:

$test1 = \Drupal::request()->request->get('name');
$test2 = \Drupal::request()->query->get('name');
$test3 = \Drupal::service('path.current')->getPath();
$test4 = \Drupal::request()->server->get('REQUEST_METHOD');
$test5 = \Drupal::request()->query->get('q');
$test6 = \Drupal::request()->request->get('keys');
$test7 = \Drupal::request()->query->get('keys');
$test8 = \Drupal::request()->query->get('destination');
$test9 = \Drupal::request()->request->all();
$test10 = \Drupal::request()->getRequestUri();

Here are the results:

Test 1: NULL

Test 2: NULL

Test 3: '/search'

Test 4: 'GET'

Test 5: NULL

Test 6: NULL

Test 7: NULL

Test 8: NULL

Test 9: array ( )

Test 10: '/search'

Why is this not working?

Answer 1

This is a duplicate. If you look at the change log, there's a beautiful example for how to retrieve $_GET and $_POST variables.

I have tested locally at /search?keys=hello and

\Drupal::request()->query->get('keys');

works, as well as

\Drupal::request()->get('keys');

I tested your custom block and it works fine. Have you tried clearing cache?

Update:

If it is caching, you can set your block to not cache, since it's a search block. Or you can set it to cache for each set of parameters. Thanks @clive for the link.

Answer 2

You were close. All you need to do is get:

$keys = \Drupal::request()->get('keys');

Here is an example of me using it:

/**
 * Implements hook_preprocess_views_view()
 * @param $variables
 */
function mytheme_preprocess_views_view(&$variables) {
  if ($variables['id'] == 'acquia_search' && $variables['display_id'] == 'results') {
    $variables['get']['keywords'] = Xss::filter(\Drupal::request()->get('keywords'));
    $variables['get']['sort_by'] = Xss::filter(\Drupal::request()->get('sort_by'));
    $variables['get']['sort_order'] = Xss::filter(\Drupal::request()->get('sort_order'));

    if (!Unicode::strlen($variables['get']['sort_by'])) {
      $variables['get']['sort_by'] = 'search_api_relevance';
    }

    if (!Unicode::strlen($variables['get']['sort_order'])) {
      $variables['get']['sort_order'] = 'DESC';
    }
  }
}

Answer 3

The problem was the block was cached. See Clive's comment:

public function build() {
  $test = \Drupal::request()->query->get('keys');
  return array(
    '#markup' => $test,
    '#cache' => array(
      'contexts' => array(
        'url.query_args:keys',
      ),
    ),
  );
}