public function getIdentityFields()
    {
        if (!$this->getEnableUsername()
            && in_array('username', $this->identityFields)
            && ($keys = array_keys($this->identityFields, 'username'))
        ) {
            foreach ($keys as $key) {
                unset($this->identityFields[$key]);
            }
        }

        return $this->identityFields;
    }
public function getIdentityFields()
    {
        if (!$this->getEnableUsername()
            && in_array('username', $this->identityFields)
            && ($keys = array_keys($this->identityFields, 'username'))
        ) {
            foreach ($keys as $key) {
                unset($this->identityFields[$key]);
            }
        }

        return $this->identityFields;
    }
{@inheritDoc}