public Url::getRouteName()
Returns the route name.
string
\UnexpectedValueException. If this is a URI with no corresponding route.
public function getRouteName() { if ($this->unrouted) { throw new \UnexpectedValueException('External URLs do not have an internal route name.'); } return $this->routeName; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Url.php/function/Url::getRouteName/8.1.x