PHP/MySQL - Threading needs slightly different order - php

Question

I have a MySQL table with id, parent and comment which I managed to order almost-as-it-should from latest to oldest. If a comment has no parent, this is set to 0.
The comments table: Table Image
Hereby my current code:
<?php
$con = mysqli_connect('host','username','password','database');
if (mysqli_connect_errno($con)) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$comments = array();
$results = mysqli_query($con,"SELECT * FROM comments ORDER BY id DESC");
while ($row = mysqli_fetch_assoc($results)) {
$parent = $row['parent'];
$comments[$parent ? $parent : 0][] = $row;
}
function thread($parent,$comments) {
foreach ($comments[$parent] as $post) {
echo "<div>";
echo $post['comment'];
$id = $post['id'];
if (isset($comments[$id])) {
thread($id,$comments);
}
echo "</div>";
}
}
thread(0,$comments);
?>
The above results in the following order (turned into a list for readability, you can do this in the code by turning the div tags into li and echoing ul tags around the foreach loop):
Third comment
Second comment
Another reply to the second comment
And another one
Reply to the second comment
Reply to a reply
First comment
Reply to the first comment
Notice that replies are ordered in a descending manner as well, just like the comments. Other than that it's completely fine and working like a charm. But this is what it's supposed to be like:
Third comment
Second comment
Reply to the second comment
Reply to a reply
Another reply to the second comment
And another one
First comment
Reply to the first comment
Shortly said: comments should be in descending order, replies in ascending. That is where I got stuck completely. Thanks a lot for your help!!

Answer 1

You can use the array_reverse function to reverse the order of the items in an array:
$results = mysqli_query($con,"SELECT * FROM comments ORDER BY id DESC");
while ($row = mysqli_fetch_assoc($results)) {
// ...
}
// Important bit: Reverse all threads except the main thread (id=0):
foreach ($comments as $key => $value) {
if ($key !== 0) {
$comments[$key] = array_reverse($value);
}
}
function thread($parent,$comments) {
// And so on...