public RouteBuilderInterface::rebuildIfNeeded()
Rebuilds the route information if necessary, and dumps it.
bool Returns TRUE if the rebuild occurs, FALSE otherwise.
public function rebuildIfNeeded();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Routing!RouteBuilderInterface.php/function/RouteBuilderInterface::rebuildIfNeeded/8.1.x