PHP排序多維數組

Question

我有一個看起來像這樣的數組：

Array
(
[13] => Array
        (
            [name] => Blah blah
            [description] => Blah blah blah
            [parent_group_id] => 8
            [display] => Blah : Blah
            [stamps] => Array
                (
                    [73] => Array
                        (
                            [stamp_id] => 73
                            [name] => Blah
                            [is_member] => 
                            [rank] => 2          <--
                            [description] => Blah blah blah
                            [rank_token] => easy
                        )
                    [80] => Array
                        (
                            [stamp_id] => 80
                            [name] => Blah
                            [is_member] => 
                            [rank] => 1          <--
                            [description] => Blah blah blah
                            [rank_token] => medium
                        )
                    [73] => Array
                        (
                            [stamp_id] => 73
                            [name] => Blah
                            [is_member] => 
                            [rank] => 4          <--
                            [description] => Blah blah blah
                            [rank_token] => easy
                        )

                    [80] => Array
                        (
                            [stamp_id] => 80
                            [name] => Blah
                            [is_member] => 
                            [rank] => 3          <--
                            [description] => Blah blah blah
                            [rank_token] => medium
                        )
                 )
          )
)

但是，我想按['rank']所持有的數字（分別為1、2、3和4）對這個數組中的對象進行排序。（我在代碼示例中添加了箭頭）因此在使用usort之后，我希望所有內容都按數字順序進行整理。 所以我希望它看起來像這樣：

Array
(
[13] => Array
        (
            [name] => Blah blah
            [description] => Blah blah blah
            [parent_group_id] => 8
            [display] => Blah : Blah
            [stamps] => Array
                (
                    [80] => Array
                        (
                            [stamp_id] => 80
                            [name] => Blah
                            [is_member] => 
                            [rank] => 1          <--
                            [description] => Blah blah blah
                            [rank_token] => medium
                        )
                    [73] => Array
                        (
                            [stamp_id] => 73
                            [name] => Blah
                            [is_member] => 
                            [rank] => 2          <--
                            [description] => Blah blah blah
                            [rank_token] => easy
                        )
                    [80] => Array
                        (
                            [stamp_id] => 80
                            [name] => Blah
                            [is_member] => 
                            [rank] => 3          <--
                            [description] => Blah blah blah
                            [rank_token] => medium
                        )
                    [73] => Array
                        (
                            [stamp_id] => 73
                            [name] => Blah
                            [is_member] => 
                            [rank] => 4          <--
                            [description] => Blah blah blah
                            [rank_token] => easy
                        )
                 )
          )
)

我的實際數組更大，但是它仍然遵循這種模式。

Answer 1

如果我正確理解了您的問題，這應該可以工作：

function cmp($a, $b)
{
    if ($a['rank'] == $b['rank']) {
        return 0;
    }
    return ($a['rank'] < $b['rank']) ? -1 : 1;
}
foreach($yourArray as &$entry) {
    uasort($entry['stamps'], "cmp");
}
unset($entry);

print_r($yourArray);

請注意，cmp功能與手冊中的功能幾乎相同。 foreach中的＆表示所創建的變量是數組成員的別名，而不是副本的別名（如PHP通常那樣）。 之所以存在unset（）是因為，如果以后嘗試使用名為$ entry的變量，則實際上是在操縱數組中的最后一個條目。

如果您對此感到不舒服，則可以通過其他方法對其進行皮膚處理。 例如，您可以創建第二個函數並將array_map映射到原始函數，從而：

function cmp($a, $b)
{
    if ($a['rank'] == $b['rank']) {
        return 0;
    }
    return ($a['rank'] < $b['rank']) ? -1 : 1;
}
function sort_entry($entry)
{
    uasort($entry['stamps'], "cmp");
    return $entry;
}
array_map('sort_entry', $yourArray);    
print_r($yourArray);