PHP Json see if value exist

Question

I've been looking all over the interwebz for a simple answer but can't find any. So, the question is:

I'm going to decode some JSON to see if a value exists; though, I don't think I'm doing it right. I want to check if the value of appid: 730 exists.

Here's the JSON:

{
response: {
    game_count: 106,
        games: [
            {
            appid: 10,
            playtime_forever: 67
            },
            {
            appid: 730,
            playtime_forever: 0
            },
            {
            appid: 368900,
            playtime_forever: 0
            },
            {
            appid: 370190,
            playtime_forever: 0
            },
        ]
    }
}

This is what I want:

$json = file_get_contents('JSON URL HERE');
$msgArray = json_decode($json, true);

if (appid: 730 exists) {
   ...
}

Thanks, hope I explained enough.

Answer 1

Firstly, you have invalid json. See the comment in the string deceleration below (this might be a typo in your question).

$json = '{
"response": {
    "game_count": 106,
    "games": [
        {
            "appid": 10,
            "playtime_forever": 67
        },
        {
            "appid": 730,
            "playtime_forever": 0
        },
        {
            "appid": 368900,
            "playtime_forever": 0
        },
        {
            "appid": 370190,
            "playtime_forever": 0
        } // <------ note the lack of `,`
        ]
    }
}';

$arr = json_decode($json, true);

foreach($arr['response']['games'] as $game) {
    if($game['appid'] === 730) { // I would strictly check (type) incase of 0
        echo "exists"; // or do something else
        break; // break out if you dont care about the rest
    }
}

example

We're just looping through the games array and checking its appid. Then we just do something and then break the loop to prevent overhead.