(PECL pecl_http >= 0.10.0)
HttpRequest::addPostFields — Add post fields
$post_data
   )Adds POST data entries, leaving previously set unchanged, unless a post entry with the same name already exists.
Affects only POST and custom requests.
post_dataan associative array as parameter containing the post fields
   Restituisce TRUE in caso di successo, FALSE in caso di fallimento.