Retrieve meta_value from add_comment_meta

Question

I have a voting function for comments which needs to display the avatars of the users who voted for a specific comment. I am having trouble getting the user id of the voter ($supporter). All I seem to get is the user ID of the user who made the comment > I need to get the user ID of the user who voted.

My function:

function addServiceSupporter($comment_id, $user_id) {
    add_comment_meta( $comment_id, 'supporting_user', $user_id, false );
}

So the $user_id is stored under meta_value in the wp_commentmeta table.

Before this function I have this the following which seems to have a user_id in it.

/**
 * After an ajax call try to add the supporter
 */
if (isset($_POST['new_service'])) {
    $new_service_supporter = $_POST['new_service'];
    try {
        addServiceSupporter($new_service_supporter['comment_id'], $new_service_supporter['user_id']);
    } catch (Exception $e) {
        print_r($e);
    }
    die;
}

The call:

foreach($supporters as $supporter) {
    $supporting_user = get_comment_meta(get_comment_ID(),'supporting_user', true);
    $avatar = get_avatar($supporting_user, 24 );

    echo $avatar; 
}

I also have tried:

$avatar = get_avatar($supporting_user, 24 );

But that of course gives the avatar of the user currently active on the page.

How do I get the $user_id aka meta_value of this comment_meta?

The result should be: Comment votes (or likes if you want) by users to the comments of others. Then showing the avatars of the people who voted. My problem = how to get the user id of the voters (not the comment author, not the current user) so I can show the right avatar?

Answer 1

You are saving your data with non-unique key (false as last argument), but retrieve it it as singular data (true as last argument).

This is likely returning you the first voter on comment. You need to retrieve complete array of values and work with it to be operating on complete data.

Answer 2

What I had to do was to:

$supporters = get_comment_meta(get_comment_ID(),'supporting_user', false);

1. Rename $supporting_user to $supporter (just like the foreach)
2. change true into false

Full code:

$supporters = get_comment_meta(get_comment_ID(),'supporting_user', false);
foreach($supporters as $supporter) {
$avatar = get_avatar($supporter, 24 );
echo $avatar; 
}

Thanks @Rast for trying to help.