Regarding Comparing JSON in PHP - php

Question

There was a question raised by Log1x about Comparing JSON after foreach loop for a Discord Channel Viewer
This is the link: Comparing JSON after foreach loop In his viewer he wanted to output something like:
<ul>
<li>Channel 1
<ul>
<li>User 1</li>
<li>User 2</li>
</ul>
</li>
<li>Channel 2</li>
<li>Channel 3
<ul>
<li>User 3</li>
</ul>
</li>
</ul>
There was an excellent answer on how to do this, from Mojtaba which was:
$discord = json_decode(file_get_contents('https://discordapp.com/api/servers/'.$id.'/widget.json'));
if ($discord->channels) {
usort($discord->channels, function($a, $b) {
return $a->position > $b->position ? 1 : -1;
});
echo '<ul>';
foreach ($discord->members as $member) {
if (!empty($member->channel_id)) {
$channel_members[$member->channel_id][] = $member->username;
}
}
foreach ($discord->channels as $channel) {
echo "<li>{$channel->name}";
if (!empty($channel_members[$channel->id])) {
echo '<ul>';
foreach ($channel_members[$channel->id] as $username) {
echo "<li>$username</li>";
}
echo '</ul>';
}
echo "</li>";
}
echo '</ul>';
}
I have already completed my viewer but you will be able to see from this screen-shot link that my available space is limited and taken up by too many empty channels. So I am interested to know if there is a way to hide channels that are empty i.e.
<ul>
<li>Channel 1
<ul>
<li>User 1</li>
<li>User 2</li>
</ul>
</li>
<li>Channel 3
<ul>
<li>User 3</li>
</ul>
</li>
</ul>
As I have said, my interest is also for a Discord Channel Viewer , so the above information from both Mojtaba and the first link are directly relevant to my code too.
Thanks in advance.

Answer 1

I think you should be able to just move your <li> tag inside the if.
foreach ($discord->channels as $channel) {
// outside the if, the channel shows even if it's empty
if (!empty($channel_members[$channel->id])) {
// inside the if, you'll only see the channel if it's not empty
echo "<li>{$channel->name}<ul>";
foreach ($channel_members[$channel->id] as $username) {
echo "<li>$username</li>";
}
echo '</ul></li>';
}
}