Access piwik api from different subdomain

I want to access piwik api from different subdomain , which are hosted on same server, using
PHP api , not the HTTP API.
Is that possible?

/?
idSite=6&
token_auth=out-outh-token&
format=json&
date=2014-10-13%2C2014-10-14&
expanded=1&
segment=eventCategory%3D%3Dgoals%3BpageUrl%3D%40some-sub-domain&
method=Events.getCategory&
module=API&
period=range