user details update when user register

function lulzbot_verified_company_user_update(&$edit, $account, $category) {

$domain_name = substr(strrchr($edit[mail], "@"), 1);
$domain = explode('.', $domain_name);


$machine_name = 'companies';
  $v = taxonomy_vocabulary_machine_name_load($machine_name);
  $terms = taxonomy_get_tree($v->vid);
 
  foreach ($terms as $term) {

 if($term->name == $domain[0]){
  $edit[field_user_companies]['und'][0] = $term->tid;
  user_save($account, $edit);
 }
  }