php-docker-lib/src/Docker/Composer/NetworkConfig.php

<?php

namespace Docker\Composer;

class NetworkConfig
{
    protected $config = [];

    /**
     * @param string $driver Driver type. By default use 'default'
     * @return NetworkConfig Return this object.
     */
    public function addDriver($driver = 'default')
    {
        $this->config['driver'] = $driver;
        return $this;
    }

    /**
     * @param string $driver Subnet. By default 172.172.172.0/24
     * @return NetworkConfig Return this object.
     */
    public function addSubnetGateway($subnet = '172.172.172.0/24')
    {
        if (!isset($this->config['config'])) {
            $this->config['config'] = [];
        }
        $this->config['config'][] = array('subnet' => $subnet);
//        $this->config['config'][] = array('gateway' => $gateway);
        return $this;
    }

    /**
     * @return array Return array with config.
     */
    public function getConfig()
    {
        return $this->config;
    }
}