How to get the base URL of a site

Question

My site is on http://drupal8.local/. How do I get the drupal8.local part of that URL?

Url::fromRoute('<'current'>') or base_path() returns the path parth of the URL; For example, for http://drupal8.local/a/b/c/d/e/f, they return '/a/b/c/d/e/f' when I just need to get 'drupal8.local'.

How can I get that part of the URL?

Answer 1

You can get the hostname, "drupal8.local", directly from the getHost() request:

$host = \Drupal::request()->getHost();

In some cases you might want to get the schema as well, fx https://drupal8.local:

$host = \Drupal::request()->getSchemeAndHttpHost();

Answer 2

There are some warnings about directly accessing the request object in this way in \Drupal::request:

 * Note: The use of this wrapper in particular is especially discouraged. Most
 * code should not need to access the request directly.  Doing so means it
 * will only function when handling an HTTP request, and will require special
 * modification or wrapping when run from a command line tool, from certain
 * queue processors, or from automated tests.
 *
 * If code must access the request, it is considerably better to register
 * an object with the Service Container and give it a setRequest() method
 * that is configured to run when the service is created.  That way, the
 * correct request object can always be provided by the container and the
 * service can still be unit tested.

Any form controller extending \Drupal\Core\Form\FormBase automatically has this dependency injected, and it may be accessed using:

$this->getRequest()->getSchemeAndHttpHost()

I think (but haven't tested) that a regular page controller extending \Drupal\Core\Controller\ControllerBase could provide the request_stack service by overriding the \Drupal\Core\Controller\ControllerBase::create function, and then setting a $request property in the constructor. This is described really well for forms, and the same process should apply for page controllers: https://www.drupal.org/docs/8/api/services-and-dependency-injection/dependency-injection-for-a-form.

Answer 3

If you'd like to do this with dependency injection and a service, then you can use RequestStack:

use Symfony\Component\HttpFoundation\RequestStack;

And define it like this:

protected $request;

public function __construct(..., RequestStack $request_stack) {
  ...
  $this->request = $request_stack->getCurrentRequest();
}

public static function create(ContainerInterface $container, ...) {
  return new static(
    ...
    $container->get('request_stack')
  )
}

And then declare it like this:

$this->request->getHost()
$this->request->getSchemeAndHttpHost()

Answer 4

Taking into account the "warnings about directly accessing the request object in this way in \Drupal::request" that Shaun Dychko mentioned, perhaps a good option to get the hostname is obtain it from the $base_url global variable, with the help of php function parse_url:

global $base_url;
$base_url_parts = parse_url($base_url);
$host = $base_url_parts['host'];

Answer 5

Code below is how core defines the [site:url] token. This works best in all cases for me in drupal 8 & 9:

$url_options = [
  'absolute' => TRUE,
  'language' => \Drupal::languageManager()->getCurrentLanguage(),
];
$site_url = Url::fromRoute('<front>', [], $url_options)->toString();

Answer 6

<?php
$url = \Drupal\Core\Url::fromUserInput('/', ['absolute' => TRUE])->toString();
?>

Answer 7

\Drupal::request()->getBaseUrl()