(PECL pecl_http >= 0.10.0)
HttpRequest::setPostFields — Set post fields
$post_data
)Set the POST data entries, overwriting previously set POST data.
Affects only POST and custom requests.
post_data
an associative array containing the post fields; if empty, the post data will be unset
成功时返回 TRUE， 或者在失败时返回 FALSE.