In reply to http://stackoverflow.com/a/16856502/744255

gistfile1.php

<?php
interface DataManagement
{

}

class Curl implements DataManagement
{
    private $configs;

    public function __construct(ConfigManagement $configManagement)
    {
        $this->configs = $configManagement->get();
    }

    public function request()
    {
        /* Some logic to do a request */
    }
}

class Db implements DataManagement
{
    private $configs;

    public function __construct(ConfigManagement $configManagement)
    {
        $this->configs = $configManagement->get();
    }
}

class Service
{
    private $dataManagement;

    public function __construct(DataManagement $dataManagement)
    {
        $this->dataManagement = $dataManagement;
    }

    public function get()
    {
        return $this->dataManagement;
    }
}

interface ConfigManagement
{
    public function get();
}

class IniConfig implements ConfigManagement
{
    public function __construct($file)
    {
        /* Some logic to read configs from file here */
    }

    public function get()
    {
        /* Some logic to return fetched data */
    }

}

$service = new Service(
    new Curl(
        new IniConfig('/file/to/config.ini')
    )
);

$service->get()->request();