Predis\Connection\StreamConnection::createResource PHP Method

    protected function createResource()
    {
        switch ($this->parameters->scheme) {
            case 'tcp':
            case 'redis':
                return $this->tcpStreamInitializer($this->parameters);
            case 'unix':
                return $this->unixStreamInitializer($this->parameters);
            case 'tls':
            case 'rediss':
                return $this->tlsStreamInitializer($this->parameters);
            default:
                throw new \InvalidArgumentException("Invalid scheme: '{$this->parameters->scheme}'.");
        }
    }