User

To make a redirection after user login, we can use the hook hook_user_login().

Note : You cannot use $form_state->setRedirectUrl() directly in the form alter, since it will be overwritten by UserForm::submitForm().

For this, You must use hook_entity_delete.



Example :

function mymodule_entity_delete(\Drupal\Core\Entity\EntityInterface $entity) {

  $entity_type = $entity->getEntityTypeId();

  $entity_id = $entity->id();



Example:

$user = User::load($uid);

user_login_finalize($user);

Get All roles:

    $roles = \Drupal\user\Entity\Role::loadMultiple();

Example:

Drupal do not like using the $_SERVER['REMOTE_ADDR']; to get the remote ip (the user ip address).

In Drupal 7, the function ip_address() exist but not in D8.

$ip = ip_address();

Store data on session.

Example:

$session = new \Symfony\Component\HttpFoundation\Session\Session();

$session->set('var_name', $session->get('var_name',0) + 1);

drupal_set_message($session->get('var_name'));

    Here an example for create a user account programmatically in Drupal 8

    $language = \Drupal::languageManager()->getCurrentLanguage()->getId();

    $user = \Drupal\user\Entity\User::create();

Drupal 8

//To get the lanuage code:

$language = \Drupal::languageManager()->getCurrentLanguage()->getId();

//To get the language name:

$language =  \Drupal::languageManager()->getCurrentLanguage()->getName();