How to programmatically login a user in to Drupal 9

By hari, 13 July, 2023

<?php
// Add this in custom submit handler.

$values = $form_state->getValues();
$username = $values['username'];
$password = $values['password'];

// Validate user credentials.
$user = $this->userAuth->authenticate($username, $password);
if ($user) {
    
  // Don't forgot to add `use Drupal\user\Entity\User;` in top.
  $user_object = User::load($user);
  user_login_finalize($user_object);
  
  // Redirect to somewhere
  $form_state->setRedirect('your.custom_module.route.name');
} else {
  // Show error username or password not working
}

How to programmatically login a user in to Drupal 9

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