How to send inbox messages with facebook sdk php

I would like to send a private message to inbox, like:

$facebook->api('/me/feed','POST',array(
'mess开发者_开发知识库age'=>'mensagem aqui',
'name'=>'nome aqui',
'caption'=>'caption aqui',
));

but send it to inbox.

it's possible do to?

I mean it:

Not possible. See Facebook Permissions and Graph API (scroll down to Publishing section).

If the user has a facebook email (like user@facebook.com) you can just send an email there. Another alternative is to do a 'private' post. See Graph API Post