php array_multisort（）：數組大小不一致

Question

我如何使用php array_multisort對數組進行排序？ 我找不到此類數組的任何示例。 我嘗試了不同的方法，但是我不斷收到錯誤array_multisort（）：數組大小不一致。

$array= Array (
    "Arnold" => Array ( "index" => 2, "games_played" => 1, "score" => 5 ),
    "Chris"  => Array ( "index" => 1, "games_played" => 1, "score" => 5 ),
    "Mike"   => Array ( "index" => 0, "games_played" => 2, "score" => 5 )
);

Answer 1

我認為您的做法不正確。 array_multisort不是其他語言中的“排序依據”（即：按某些屬性對數組元素進行排序），而是對第一個數組進行排序，並將該順序回盪到所有后續數組。 並且在相等的情況下，它檢查第二個數組的對應值，等等。

如果要按分數（desc），按游戲方式，按索引（然后按名稱）來排序示例，則應永遠不會發生這種情況，因為索引是唯一的，所以應該這樣做：

$array= Array (
    "Arnold" => Array ( "index" => 2, "games_played" => 1, "score" => 5 ),
    "Chris" => Array ( "index" => 1, "games_played" => 1, "score" => 5 ),
    "Mike" => Array ( "index" => 0, "games_played" => 2, "score" => 5 )
);
$names = [];
$indexes = [];
$games_played = [];
$scores = [];
foreach ($array as $name => $player) {
    $names[] = $name;
    $indexes[] = $player['index'];
    $games_played[] = $player['games_played'];
    $scores[] = $player['score'];
}
array_multisort(
    $scores, SORT_DESC,
    $games_played,
    $indexes,
    $names,
    $array /* This line will sort the initial array as well */
);