Using PHP to find specific entry in JSON URL response

Question

I am trying to find out whether a user is part of a Steam group. To do this, I'm using Steam's Web API, and using URL:

https://api.steampowered.com/ISteamUser/GetUserGroupList/v1/?key=APIKEYHERE&steamid=STEAMID64HERE

To get a JSON response of all groups that a user is part of. Now I want to find out if they're part of my specific group with ID: 1111111 using PHP.

How would one do that? Currently I have the code being decoded like so:

$groupid = "1111111";
$url = "https://api.steampowered.com/ISteamUser/GetUserGroupList/v1/?key=APIKEYHERE&steamid=STEAMID64HERE";
$result = file_get_contents($url);
// Will dump a beauty json :)
$pretty = json_decode($result, true);

This makes the $pretty variable contain the entire JSON response. How would I use PHP to find the group ID in a response that looked like this?

    {
    "response": {
        "success": true,
        "groups": [
            {
                "gid": "4458711"
            },
            {
                "gid": "9538146"
            },
            {
                "gid": "11683421"
            },
            {
                "gid": "24781197"
            },
            {
                "gid": "25160263"
            },
            {
                "gid": "26301716"
            },
            {
                "gid": "29202157"
            },
            {
                "gid": "1111111"
            }
        ]

    }
}

Can't figure it out. Any help? :)

Answer 1

Use the below code to check whether user is exist in the response or not

$groupid = "1111111";
$is_exists = false;
$url = "https://api.steampowered.com/ISteamUser/GetUserGroupList/v1/?key=APIKEYHERE&steamid=STEAMID64HERE";
$result = file_get_contents($url);

// Will dump a beauty json :)
$pretty = json_decode($result, true);
foreach ($pretty['response']['groups'] as $key => $value) {
    if($value['gid'] == $groupid) {
        $is_exists = true;
        break;
    }
}

// check is_exists

Check that above variable $is_exists for true or false