Example 1: php sort array of array by key
$inventory = [
['price' => 10.99, 'product' => 'foo 1'],
['price' => 5.99, 'product' => 'foo 2'],
['price' => 100, 'product' => 'foo 3'],
];
$price = array_column($inventory, 'price');
array_multisort($price, SORT_DESC, $inventory);
Example 2: 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);
$room_details = array(
"2020-09-24": [
...
],
"2020-09-27": [
...
],
);