SimpleXMLElement Object
(
    [code] => 15
    [msg] => Remote service error
    [sub_code] => isv.MOBILE_NUMBER_ILLEGAL
    [sub_msg] => 号码格式错误
    [request_id] => zqbnzcj7btxy
)

$result=$obj->sub_msg;

结果：号码格式错误

SimpleXMLElement Object
(
    [result] => SimpleXMLElement Object
        (
            [err_code] => 0
            [model] => 100863158072^1101308124312
            [success] => true
        )

    [request_id] => 101yy013xxd
)

$result=$obj->result->success;

结果：true