php关于遍历json数据的问题

Question

想写一个获取qq群公告列表的接口，代码如下

$skey=$_REQUEST["skey"];
$uin=$_REQUEST["uin"];
$pskey=$_REQUEST["pskey"];
$group=$_REQUEST["group"];
$url="https://qun.qq.com/cgi-bin/feeds/get_list";
$header=array("Cookie: p_uin=o".$uin."; p_skey=".$pskey."; uin=o".$uin."; skey=".$skey."; ");
$data='qid='.$group.'&i=1&n=999999999&s=-1';
$curl=curl_init();
curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl,CURLOPT_HTTPHEADER,$header);
curl_setopt($curl,CURLOPT_POST,1);
curl_setopt($curl,CURLOPT_POSTFIELDS,$data);
curl_setopt($curl,CURLOPT_TIMEOUT,30);
curl_setopt($curl,CURLOPT_FOLLOWLOCATION,1);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,FALSE);
curl_setopt($curl,CURLOPT_SSL_VERIFYHOST,FALSE);
$return=curl_exec($curl);
curl_close($curl);
$json=json_decode($return,true);
print_r($json);

返回的数据如下

Array
(
    [ec] => 0
    [feeds] => Array
        (
            [0] => Array
                (
                    [cn] => 0
                    [fid] => 9d09a53f00000000e62e0661acc50a00
                    [fn] => 0
                    [msg] => Array
                        (
                            [text] => 测试
                            [text_face] => 测试
                            [title] => 群公告
                        )

                    [pubt] => 1627795174
                    [type] => 6
                    [u] => 2707617427
                    [vn] => 0
                )

            [1] => Array
                (
                    [cn] => 0
                    [fid] => 9d09a53f000000006f5605617b110300
                    [fn] => 0
                    [msg] => Array
                        (
                            [text] => 123
                            [text_face] => 123
                            [title] => 群公告
                        )

                    [pubt] => 1627739759
                    [type] => 6
                    [u] => 2707617427
                    [vn] => 0
                )

            [2] => Array
                (
                    [cn] => 0
                    [fid] => 9d09a53f0000000075050561f4710200
                    [fn] => 0
                    [msg] => Array
                        (
                            [text] => 测试
                            [text_face] => 测试
                            [title] => 群公告
                        )

                    [pubt] => 1627719029
                    [type] => 6
                    [u] => 2707617427
                    [vn] => 0
                )

            [3] => Array
                (
                    [cn] => 0
                    [fid] => 9d09a53f0000000000b20461f5430c00
                    [fn] => 0
                    [msg] => Array
                        (
                            [text] => 测试
                            [text_face] => 测试
                            [title] => 群公告
                        )

                    [pubt] => 1627697664
                    [type] => 6
                    [u] => 2707617427
                    [vn] => 0
                )
> 

        )

    [gln] => 6
    [gsi] => BBMh4R53mnx2ziOXcNmXzI8epAZ-27IAajj9VEiHj9NZTSSp-n_TmnWa4K2bVtzduQNqaIjnP_o52iCVRwcKgQ@@
    [pv] => 0
    [svrt] => 1627802092
    [tst] => 10
    [ui] => Array
        (
            [2113224879] => Array
                (
                    [f] => http://thirdqq.qlogo.cn/g?b=sdk&k=kkQMqE0cobpYQFy0diaUiaicw&s=40&t=1598403951
                    [n] => 空白
                )

            [2707617427] => Array
                (
                    [f] => http://thirdqq.qlogo.cn/g?b=sdk&k=SdqkjAk1GJxwutickSoiaY9w&s=40&t=1591501875
                    [n] => ？？？
                )

        )

)

该如何将获取到的json输出成这个样子：
公告1
内容：测试
账号：2707617427
公告id：json里的fid
公告2
内容：测试
账号：2707617427
公告id：json里的fid
这样类推下去

Answer 1

$res = "";
foreach ($data['feeds'] as $k=>$v){
    $res .= "公告".$k."\n";
    $res .= "内容：".$v['msg']['text']."\n";
    $res .= "账号：".$v['u']."\n";
    $res .= "公告id：".$v['fid']."\n";
}