json解码电报机器人

Question

I have this file json received from asking the photo profile picture in php in a telegram bot and I want to save only some few information about it.
This is the code:

{
"ok": true,
"result": {
    "total_count": 16,
    "photos": [
        [
            {
                "file_id": "2342423423252",
                "file_size": 13038,
                "width": 160,
                "height": 160
            },
            {
                "file_id": "2342423423252",
                "file_size": 13038,
                "width": 160,
                "height": 160
            },
            {
                "file_id": "2342423423252",
                "file_size": 13038,
                "width": 160,
                "height": 160
            }
        ],
        [
            {
                "file_id": "2342423423252",
                "file_size": 13038,
                "width": 160,
                "height": 160
            },
            {
                "file_id": "2342423423252",
                "file_size": 13038,
                "width": 160,
                "height": 160
            },
            {
                "file_id": "2342423423252",
                "file_size": 13038,
                "width": 160,
                "height": 160
            }
        ],
          ...

I have to save only the file_id, but I don't know how to do it.

Not necessarily all the file_id, just once! Sorry for my bad english.. Someone can help me?

Answer 1

$x = json_decode($yourJSON, true);
$id = $x["result"]["photos"][0][0]["file_id"]