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  1. <?php
  2.  
  3. $origin = array(
  4.     array(
  5.         'id' => '1',
  6.         'size' => '500',
  7.         'message' => 'a',
  8.     ),
  9.     array(
  10.         'id' => '2',
  11.         'size' => '400',
  12.         'message' => 'd',
  13.     ),
  14.     array(
  15.         'id' => '3',
  16.         'size' => '1200',
  17.         'message' => 'b',
  18.     ),
  19.     array(
  20.         'id' => '4',
  21.         'size' => '800',
  22.         'message' => 'c',
  23.     ),
  24. );
  25.  
  26. // array_multisortを使う場合
  27. $copy1 = $origin;
  28. $base = array();
  29. foreach ($copy1 as $item)
  30.     $base[] = $item['id'];
  31. array_multisort($base,SORT_DESC,$copy1);
  32.  
  33. // usortを使う場合
  34. $copy2 = $origin;
  35. $func = function($a,$b) {
  36.     return intval($b['id']) - intval($a['id']);
  37. };
  38. usort($copy2,$func);
  39.  
  40. // 結果確認
  41. var_dump(
  42.     '元の配列',
  43.     $origin,
  44.     'array_multisort',
  45.     $copy1,
  46.     'usort',
  47.     $copy2
  48. );
  49.  
  50.  
  51.  
  52.  
Success #stdin #stdout 0.02s 20520KB
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string(12) "元の配列"
array(4) {
  [0]=>
  array(3) {
    ["id"]=>
    string(1) "1"
    ["size"]=>
    string(3) "500"
    ["message"]=>
    string(1) "a"
  }
  [1]=>
  array(3) {
    ["id"]=>
    string(1) "2"
    ["size"]=>
    string(3) "400"
    ["message"]=>
    string(1) "d"
  }
  [2]=>
  array(3) {
    ["id"]=>
    string(1) "3"
    ["size"]=>
    string(4) "1200"
    ["message"]=>
    string(1) "b"
  }
  [3]=>
  array(3) {
    ["id"]=>
    string(1) "4"
    ["size"]=>
    string(3) "800"
    ["message"]=>
    string(1) "c"
  }
}
string(15) "array_multisort"
array(4) {
  [0]=>
  array(3) {
    ["id"]=>
    string(1) "4"
    ["size"]=>
    string(3) "800"
    ["message"]=>
    string(1) "c"
  }
  [1]=>
  array(3) {
    ["id"]=>
    string(1) "3"
    ["size"]=>
    string(4) "1200"
    ["message"]=>
    string(1) "b"
  }
  [2]=>
  array(3) {
    ["id"]=>
    string(1) "2"
    ["size"]=>
    string(3) "400"
    ["message"]=>
    string(1) "d"
  }
  [3]=>
  array(3) {
    ["id"]=>
    string(1) "1"
    ["size"]=>
    string(3) "500"
    ["message"]=>
    string(1) "a"
  }
}
string(5) "usort"
array(4) {
  [0]=>
  array(3) {
    ["id"]=>
    string(1) "4"
    ["size"]=>
    string(3) "800"
    ["message"]=>
    string(1) "c"
  }
  [1]=>
  array(3) {
    ["id"]=>
    string(1) "3"
    ["size"]=>
    string(4) "1200"
    ["message"]=>
    string(1) "b"
  }
  [2]=>
  array(3) {
    ["id"]=>
    string(1) "2"
    ["size"]=>
    string(3) "400"
    ["message"]=>
    string(1) "d"
  }
  [3]=>
  array(3) {
    ["id"]=>
    string(1) "1"
    ["size"]=>
    string(3) "500"
    ["message"]=>
    string(1) "a"
  }
}
https://ideone.com/liPvUD
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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