PartKeepr\AuthBundle\Entity\User::getUsername PHP Method

    public function getUsername()
    {
        return $this->username;
    }

 /**
  * Deletes an user from the FOSUser system
  * @param User $user
  */
 public function deleteFOSUser(User $user)
 {
     if ($user->getProvider()->getType() !== self::BUILTIN_PROVIDER) {
         return;
     }
     $FOSUser = $this->userManager->findUserByUsername($user->getUsername());
     if ($FOSUser !== null) {
         $this->userManager->deleteUser($FOSUser);
     }
 }