Yii2: How to link from backend to frontend when both are in the same domain? - yii

Question

I want to try to make an URL from backend to frontend, I tried to add the following code in backend/config/main.php but it didn't worked.
'urlManagerFrontEnd' => [
'class' => 'yii\web\urlManager',
'baseUrl' => '/',
'enablePrettyUrl' => true,
'showScriptName' => false,
],
Then when I tried this code, it showed "localhost/admin" instead just "localhost" (where the frontend is).
echo Html::a(Yii::t('app', 'test'), [Yii::$app->urlManagerFrontEnd->createUrl(['/'])]);
Just for reference, both frontend/web and backend/web are inside a folder called "public". frontend/web is in the root of public folder while backend/web is inside an admin folder which is inside the public one.

Answer 1

An example of implementation on a project with three subdomains.
Config in common
'urlManagerBackend' => \yii\helpers\ArrayHelper::merge(
[
'hostInfo' => env('BACKEND_HOST_INFO'),
'baseUrl' => env('BACKEND_BASE_URL'),
],
require(Yii::getAlias('#backend/config/_urlManager.php'))
),
'urlManagerFrontend' => \yii\helpers\ArrayHelper::merge(
[
'hostInfo' => env('FRONTEND_HOST_INFO'),
'baseUrl' => env('FRONTEND_BASE_URL'),
],
require(Yii::getAlias('#frontend/config/_urlManager.php'))
),
Env - it is configuration file
FRONTEND_HOST_INFO = http://site.lan
BACKEND_HOST_INFO = http://admin.site.lan
another project, realization - backend - web.php
$config = [
'components' => [
'urlManagerF' => [
'class' => 'yii\web\urlManager',
'baseUrl'=>env('FRONTEND_HOST_INFO'),
'enablePrettyUrl' => true,
'showScriptName' => false,
'rules' => [],
],
'urlManagerS' => [
'class' => 'yii\web\urlManager',
'baseUrl'=>env('STORAGE_HOST_INFO'),
'enablePrettyUrl' => true,
'showScriptName' => false,
'rules' => [],
],
],
],