How to give a unique ID to each inserted item in array?

Question

I run a situation where I put stuff into array like that:

    $current_pms[] = array(
        'from' => sofa_get_username($current_user->ID),
        'to' => $valid_user,
        'subject' => $subject,
        'message' => $message,
        'status' => 'unread',
        'time' => current_time('mysql', $gmt = 0)
    );

How can I mark each entry with its own unique ID so I can grab it later?

Thanks

Answer 1

You can always self-assign incremental numbers, that's one option.

$id = count($array)+1;
$array[$id] = array (...)

Or you can just use any key/value pairs.

$array['id'] = ...
$array[123]  = ...