$this->url() to another subdomain

Question

Hello,

I created subdomain for my application.

host_www.type = "Zend_Controller_Router_Route_Hostname"
host_www.route = "www.mywebsite.com"
host_www.defaults.module = "default"
host_www.defaults.controller = "index"
host_www.defaults.action = "index"

store_infos.route = "storeinfos/:store"
store_infos.defaults.controller = "store"
store_infos.defaults.action = "store-infos"
store_infos.defaults.module = "default"
store_infos.chain = "host_www"

host_products.type = "Zend_Controller_Router_Route_Hostname"
host_products.route = "products.mywebsite.com"
host_products.defaults.module = "products"
host_products.defaults.controller = "products"
host_products.defaults.action = "index"

product_infos.type = "Zend_Controller_Router_Route_Regex"
product_infos.route = "([-\w]+).htm"
product_infos.reverse = "%s.htm"
product_infos.map.1 = "q"
product_infos.defaults.module = "products"
product_infos.defaults.controller = "products"
product_infos.defaults.action = "see-product"
product_infos.chain = "host_products"

I don't know if the syntax in this zend config ini file is correct, in particular for routes chaining.

Once I'm on this subdomain, urls constructed with $this->url() like this :

<a href="<?= $this->url(array('store' => 1234), 'store_infos', true) ?>">
See store informations
</a>

still point to the subdomain products.mywebsite.com, where I want it to point to www.mywebsite.com

For the moment, I do this :

<a href="http://www.mywebsite.com&lt;?= $this->url(array('store' => 1234), 'store_infos', true) ?>">
See store informations
</a>

But it's not flexible at all.

Is there a solution, a parameter to add, or my config file is wrong ?

thanks in advance for your help.