PHP - Parsing JSON from FB Graph

[TSeed]

Hello everyone, I am new to parsing and properly referencing JSON objects or associative arrays in PHP with the Facebook Graph API.

Here is an example of JSON i will be working with:
https://graph.facebook.com/comments/...layer_embedded

$request_url ="https://graph.facebook.com/comments/?ids=" . $purl;
$requests = file_get_contents($request_url);
$fb_response = json_decode($requests);

How can I implement a foreach function to cycle through and echo the id's of each element in the data array?

Thanks in advance!