src/SimpleUser/UserManager.php
public function findOneBy(array $criteria)
    {
        $users = $this->findBy($criteria);

        if (empty($users)) {
            return null;
        }

        return reset($users);
    }
public function findOneBy(array $criteria)
    {
        $users = $this->findBy($criteria);

        if (empty($users)) {
            return null;
        }

        return reset($users);
    }
Get a single User instance that matches the given criteria. If more than one User matches, the first result is returned.

@param array $criteria
@return User|null