Answers for "php order array by key"

sort array by key value in php

$inventory = array(

   array("type"=>"fruit", "price"=>3.50),
   array("type"=>"milk", "price"=>2.90),
   array("type"=>"pork", "price"=>5.43),

);
$price = array_column($inventory, 'price');
array_multisort($price, SORT_DESC, $inventory);

php sort array by key

$weight = [
    'Pete' => 75, 
    'Benjamin' => 89,
    'Jonathan' => 101
  ];  	
  ksort($weight);

php sort array by value and keep key

$weight = [
    'Pete' => 75,
    'Benjamin' => 309,
    'Jonathan' => 101
];
asort($weight);
/*
weight is now:
Array
(
    [Pete] => 75
    [Jonathan] => 101
    [Benjamin] => 309
)
To sort descending instead use: arsort
*/

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);

php array sort by key value

To PHP sort array by key, you should use: 
	ksort() (for ascending order) or krsort() (for descending order). 
      
To PHP sort array by value, you will need functions:
	asort() and arsort() (for ascending and descending orders).

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": [
               ...
      ],
);