CURL body on error

Currently I have code that looks like:

            $result = curl_exec($this->_ch);
            if( $result === false)
            {
                $info = curl_getinfo($this->_ch);
                $errormsg =  'ModifyPresentationProperty error: ' . curl_error($this->_ch);
                throw new \Exception($errormsg);
            }
            $jsonresult = json_decode($result);
The problem that when there is an error the server puts additional error information in the body of the response ("odata.error"). How do I access the data in the body when there is an error? Right now I only get $result which is false in the event of an error and curl_error only gives me the error code and a string describing the error code. The function curl_info seems to return only information about the request.

This is CURL that comes with PHP 5.5.7. Curl reports version 7.30.0 Thank you.