which function used to sort array in descending order in php code example

Example 1: php sort()

<?php

$fruits = array("Zitrone", "Orange", "Banane", "Apfel");
sort($fruits);
foreach ($fruits as $key => $val) {
    echo "fruits[" . $key . "] = " . $val . "\n";
}

?>

Example 2: array sort php

// array sort php
$room_details = array(
      "2020-09-27": [
                {
                    "content": "how are you",
                    "detail_id": "1",
                    "time": "17:57:28",
                    "chat_time": "2020-09-24 17:57:28",
                    "width": "0",
                    "height": "0",
                    "type": "1",
                    "distance_time": "26 days ago",
                    "avatar": "uploads/MemberImage/20200922-1436-image-5f699b536f438-0.png",
                    "position": 2
                },
                {
                    "content": "I am fine, thanks",
                    "detail_id": "2",
                    "time": "17:57:45",
                    "chat_time": "2020-09-24 17:57:45",
                    "width": "0",
                    "height": "0",
                    "type": "1",
                    "distance_time": "26 days ago",
                    "avatar": "uploads/MemberImage/20200922-1436-image-5f699b536f438-0.png",
                    "position": 2
                },
      ],
	 "2020-09-24": [
                {
                    "content": "how are you",
                    "detail_id": "1",
                    "time": "17:57:28",
                    "chat_time": "2020-09-24 17:57:28",
                    "width": "0",
                    "height": "0",
                    "type": "1",
                    "distance_time": "26 days ago",
                    "avatar": "uploads/MemberImage/20200922-1436-image-5f699b536f438-0.png",
                    "position": 2
                },
                {
                    "content": "I am fine, thanks",
                    "detail_id": "2",
                    "time": "17:57:45",
                    "chat_time": "2020-09-24 17:57:45",
                    "width": "0",
                    "height": "0",
                    "type": "1",
                    "distance_time": "26 days ago",
                    "avatar": "uploads/MemberImage/20200922-1436-image-5f699b536f438-0.png",
                    "position": 2
                },
      ],
);

sort($room_details);

// result
// array sort php
$room_details = array(
      "2020-09-24": [
                ...
      ],
	 "2020-09-27": [
               ...
      ],
);