从结果解析结果 - php

我如何在此响应中获取费用值

我正在将邮递员 api 集成到 php 应用程序中，因为我正在使用来自 php 的 curl 调用，

这是代码

<?php
class PostMates extends Controller {
public function getDeliveryQuote()
    {
            $url = "https://api.postmates.com/v1/customers/cus_XX/delivery_quotes";
    $uname = "70538e7";
    $pwd = "xxxx";
    $process = curl_init($url);
    curl_setopt($process, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded','Accept: application/json'));
    curl_setopt($process, CURLOPT_HEADER, 1);
    curl_setopt($process, CURLOPT_USERPWD, $uname . ":" . $pwd);
    curl_setopt($process, CURLOPT_TIMEOUT, 30);
    curl_setopt($process, CURLOPT_POST, 1);
    curl_setopt($process, CURLOPT_POSTFIELDS, "dropoff_address=20 McAllister St, San Francisco, CA 94102&pickup_address=101 Market St, San Francisco, CA 94105");
    curl_setopt($process, CURLOPT_RETURNTRANSFER, TRUE);
    curl_setopt($process, CURLOPT_SSL_VERIFYPEER, false);
    $return = curl_exec($process);
    curl_close($process);
    //var_dump($return);
    print_r($return);

    }
}

虽然我确实print_r和var_dump，但下面给出的是回应。

我怎样才能从共振中获得费用金额。

我尝试了$response->费和$resonse["费用"]，但我没有得到结果。

我怎么能得到它.请帮忙

HTTP/1.1 200 OK
Server: cloudflare-nginx
Date: Sun, 28 Feb 2016 18:26:14 GMT
Content-Type: application/json
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: __cfduid=d7e72569c2358ea8636fac1a1054815081456683973; expires=Mon, 27-Feb-17 18:26:13 GMT; path=/; domain=.postmates.com; HttpOnly
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
X-XSS-Protection: 1; mode=block
CF-RAY: 27be2d3566b42fd5-MAA
{"kind": "delivery_quote", "fee": 750, "created": "2016-02-28T18:26:14Z", "expires": "2016-02-28T18:31:14Z", "currency": "usd", "duration": 60, "dropoff_eta": "2016-02-28T19:31:14Z", "id": "dqt_KhBvlVTh8vQ8N-"}