GraphAware\Reco4PHP\Transactional\BaseCypherAware::addParameter PHP Method

    protected final function addParameter($key, $value)
    {
        if (!is_scalar($value) && !is_array($value)) {
            throw new \InvalidArgumentException(sprintf("Expected a scalar or array value for '%s'", $key));
        }
        $this->parameters[$key] = $value;
    }