mobile_homepage:
 path:  /
 host:  m.example.com
 defaults: { _controller: AcmeDemoBundle:Main:mobileHomepage }
homepage:
 path:  /
 defaults: { _controller: AcmeDemoBundle:Main:homepage }

<?xml version="1.0" encoding="UTF-8" ?>
<routes xmlns="http://symfony.com/schema/routing"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://symfony.com/schema/routing
  http://symfony.com/schema/routing/routing-1.0.xsd">
 <route id="mobile_homepage" path="/" host="m.example.com">
  <default key="_controller">AcmeDemoBundle:Main:mobileHomepage</default>
 </route>
 <route id="homepage" path="/">
  <default key="_controller">AcmeDemoBundle:Main:homepage</default>
 </route>
</routes>

use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;
$collection = new RouteCollection();
$collection->add('mobile_homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:mobileHomepage',
), array(), array(), 'm.example.com'));
$collection->add('homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:homepage',
)));
return $collection;

projects_homepage:
 path:  /
 host:  "{project_name}.example.com"
 defaults: { _controller: AcmeDemoBundle:Main:mobileHomepage }
homepage:
 path:  /
 defaults: { _controller: AcmeDemoBundle:Main:homepage }

<?xml version="1.0" encoding="UTF-8" ?>
<routes xmlns="http://symfony.com/schema/routing"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://symfony.com/schema/routing
  http://symfony.com/schema/routing/routing-1.0.xsd">
 <route id="projects_homepage" path="/" host="{project_name}.example.com">
  <default key="_controller">AcmeDemoBundle:Main:mobileHomepage</default>
 </route>
 <route id="homepage" path="/">
  <default key="_controller">AcmeDemoBundle:Main:homepage</default>
 </route>
</routes>

use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;
$collection = new RouteCollection();
$collection->add('project_homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:mobileHomepage',
), array(), array(), '{project_name}.example.com'));
$collection->add('homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:homepage',
)));
return $collection;

mobile_homepage:
 path:  /
 host:  "{subdomain}.example.com"
 defaults:
  _controller: AcmeDemoBundle:Main:mobileHomepage
  subdomain: m
 requirements:
  subdomain: m|mobile
homepage:
 path:  /
 defaults: { _controller: AcmeDemoBundle:Main:homepage }

<?xml version="1.0" encoding="UTF-8" ?>
<routes xmlns="http://symfony.com/schema/routing"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://symfony.com/schema/routing
  http://symfony.com/schema/routing/routing-1.0.xsd">
 <route id="mobile_homepage" path="/" host="{subdomain}.example.com">
  <default key="_controller">AcmeDemoBundle:Main:mobileHomepage</default>
  <default key="subdomain">m</default>
  <requirement key="subdomain">m|mobile</requirement>
 </route>
 <route id="homepage" path="/">
  <default key="_controller">AcmeDemoBundle:Main:homepage</default>
 </route>
</routes>

use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;
$collection = new RouteCollection();
$collection->add('mobile_homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:mobileHomepage',
 'subdomain' => 'm',
), array(
 'subdomain' => 'm|mobile',
), array(), '{subdomain}.example.com'));
$collection->add('homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:homepage',
)));
return $collection;

mobile_homepage:
 path:  /
 host:  "m.{domain}"
 defaults:
  _controller: AcmeDemoBundle:Main:mobileHomepage
  domain: '%domain%'
 requirements:
  domain: '%domain%'
homepage:
 path: /
 defaults: { _controller: AcmeDemoBundle:Main:homepage }

<?xml version="1.0" encoding="UTF-8" ?>
<routes xmlns="http://symfony.com/schema/routing"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://symfony.com/schema/routing http://symfony.com/schema/routing/routing-1.0.xsd">
 <route id="mobile_homepage" path="/" host="m.{domain}">
  <default key="_controller">AcmeDemoBundle:Main:mobileHomepage</default>
  <default key="domain">%domain%</default>
  <requirement key="domain">%domain%</requirement>
 </route>
 <route id="homepage" path="/">
  <default key="_controller">AcmeDemoBundle:Main:homepage</default>
 </route>
</routes>

use Symfony\Component\Routing\RouteCollection;
use Symfony\Component\Routing\Route;
$collection = new RouteCollection();
$collection->add('mobile_homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:mobileHomepage',
 'domain' => '%domain%',
), array(
 'domain' => '%domain%',
), array(), 'm.{domain}'));
$collection->add('homepage', new Route('/', array(
 '_controller' => 'AcmeDemoBundle:Main:homepage',
)));
return $collection;

acme_hello:
 resource: '@AcmeHelloBundle/Resources/config/routing.yml'
 host:  "hello.example.com"

<?xml version="1.0" encoding="UTF-8" ?>
<routes xmlns="http://symfony.com/schema/routing"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://symfony.com/schema/routing http://symfony.com/schema/routing/routing-1.0.xsd">
 <import resource="@AcmeHelloBundle/Resources/config/routing.xml" host="hello.example.com" />
</routes>

use Symfony\Component\Routing\RouteCollection;
$collection = new RouteCollection();
$collection->addCollection($loader->import("@AcmeHelloBundle/Resources/config/routing.php"), '', array(), array(), array(), 'hello.example.com');
return $collection;

$crawler = $client->request(
 'GET',
 '/homepage',
 array(),
 array(),
 array('HTTP_HOST' => 'm.' . $client->getContainer()->getParameter('domain'))
);