Getting Instagram subscription JSON data from post in PHP

This whole process of subscriptions for the Instagram API seems to be less than straight forward.

I have some code set up to receive the post data sent when Instagram hits me with a notification of a post from one of my subscriptions. However when I try to view the data, the raw JSON, it posts I can't get at it. If I print_r or var_dump I just get the number 1.

See my code for accessing the data:

    // Catches realtime updates from Instagram
if ($_SERVER['REQUEST_METHOD']==='POST') {
     // Retrieves the POST data from Instagram
    $update = file_get_contents('php://input');
    $data = json_decode($update);

    var_dump($data); //Outputs 1
    print_r($data[0]); //Outputs 1

}

How can I get at the JSON as an array?

This is what the JSON should look like:

[
    {
        "subscription_id": "1",
        "object": "user",
        "object_id": "1234",
        "changed_aspect": "media",
        "time": 1297286541
    },
    {
        "subscription_id": "2",
        "object": "tag",
        "object_id": "nofilter",
        "changed_aspect": "media",
        "time": 1297286541
    },
    ...
]

Thanks for any help.

Update 1

I've used PHP to print the HTTP headers. There's content because it show's it's length. Still unable to get at it though. This rules out it being an Instagram issue, I think

Solution

Woop found the problem and solved it. It's not easy to debug because all of this happens when Instagram hit your page so you don't really see the output.

What I needed to do was create a foreach loop to run through the decoded JSON. After a lot of debugging and head scratching the JSON isn't empty, it just starts with a JSON array.

Anyway here's the code now that works:

// Catches realtime updates from Instagram
    if ($_SERVER['REQUEST_METHOD']==='POST') {
         // Retrieves the POST data from Instagram
        $update = file_get_contents('php://input');
        $data = json_decode($update);

        foreach($data as $k => $v) // can be multiple updates per call
        {
            $sub_id = $v->subscription_id; //Contains the JSON values
            $user = $v->object_id;
        }
     }

If you want to see the outputs from $sub_id for example I suggest logging them or email them to yourself for example.