drupal 8 url add get parameters code example

Example 1: drupal 8 get url query parameters

// URL query parameter.
\Drupal::request()->query->get('keys');

\Drupal::request()->query->all()

Example 2: drupal 8 get argument from url

$current_path = substr(\Drupal::service('path.current')->getPath(), 1);
$path_args = explode('/', $current_path);