List of everyone who has submitted Joind.in talk comments for a given event

talks.php

<?php

$eventId = 7021;
#$eventId = 7045; #Yorkshire, for testing

$comments = json_decode(file_get_contents('https://api.joind.in/v2.1/events/'.$eventId.'/talk_comments?resultsperpage=9999'), true)['comments'];

$users = [];

foreach ($comments as $comment) {
    $users[$comment['user_display_name'] . ' (' . $comment['username'] . ')'] = true;
}

uksort($users, function($a, $b) { return strcasecmp($a, $b); });

?>

<ol>
<?php foreach (array_keys($users) as $user): ?>
<li><?= $user ?></li>
<?php endforeach; ?>
</ol>