public AccountInterface::getAccountName()
Returns the unaltered login name of this account.
string An unsanitized plain-text string with the name of this account that is used to log in. Only display this name to admins and to the user who owns this account, and only in the context of the name used to login. For any other display purposes, use \Drupal\Core\Session\AccountInterface::getDisplayName() instead.
public function getAccountName();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Session!AccountInterface.php/function/AccountInterface::getAccountName/8.1.x