php数组的分组和排序

Question

我有一个数组（$myArray）

Array ( [0] => 
          Array ( [0] => new
                  [1] => NFL930
                  [2] => Ohio
                  ...
                )
        [1] =>
          Array ( [0] => new
                  [1] => MLB382
                  [2] => Florida
                  ...
                )
        [2] =>
          Array ( [0] => new
                  [1] => MLB101
                  [2] => Vermont
                  ...
                )
        [3] =>
          Array ( [0] => new
                  [1] => NFL732
                  [2] => Alabama
                  ...
                )
        [4] =>
          Array ( [0] => old
                  [1] => MLB490
                  [2] => Texas
                  ...
                )
        [5] =>
          Array ( [0] => old
                  [1] => MLB821
                  [2] => Atlanta
                  ...
                )
        [6] =>
          Array ( [0] => old
                  [1] => NFL293
                  [2] => Maine
                  ...
                )
        .....
     )

我有一个对上面显示的 [0] 索引进行排序的函数，因此所有“新”条目都在前面，然后列出所有“旧”条目。

usort($myArray, function($a, $b) use ($myValues){
    return $myValues[$a[0]] - $myValues[$b[0]];
  });

数组 $myValues 看起来像

Array ( [New] => 0 [Old] => 1 [Other] => 2 )

我想保持 [0] 索引排序，首先显示所有新的数组，然后显示旧的数组，等等。然后我想在 MLB 的数组之前显示带有“NFL”的数组。例如，所需的输出将是

Array ( [0] => 
      Array ( [0] => new
              [1] => NFL930
              [2] => Ohio
              ...
            )
    [1] =>
      Array ( [0] => new
              [1] => NFL732
              [2] => Alabama
              ...
            )
    [2] =>
      Array ( [0] => new
              [1] => MLB101
              [2] => Vermont
              ...
            )
    [3] =>
      Array ( [0] => new
              [1] => MLB382
              [2] => Florida
              ...
            )
    [4] =>
      Array ( [0] => old
              [1] => NFL293
              [2] => Maine
              ...
            )
    [5] =>
      Array ( [0] => old
              [1] => MLB821
              [2] => Atlanta
              ...
            )
    [6] =>
      Array ( [0] => old
              [1] => MLB490
              [2] => Texas
              ...
            )
    .....
 )

Answer 1

您可以修改您的用户排序：

usort($myArray, function($a, $b) use ($myValues){
   if ($myValues[$a[0]] - $myValues[$b[0]] == 0) {
       return strcmp($a[1],$b[1]);
   }
   return $myValues[$a[0]] - $myValues[$b[0]];
});

如果条目在索引 0 上相同，则这将根据索引 1 对条目进行排序（这意味着 NFL 位于 MLB 之前，而且 NFL001 也位于 NFL002 之前）

Answer 2

您可以按第一列然后按第二列的前缀进行自定义排序。

array_multisort()

：（演示）

$priority0 = array_flip(['new', 'old', 'other']);
$priority1 = array_flip(['NFL', 'MLB']);
array_multisort(
    array_map(
        fn($row) => $priority0[$row[0]] ?? PHP_EOL,
        $array
    ),
    array_map(
        fn($row) => $priority1[rtrim($row[1], '0..9')] ?? PHP_EOL,
        $array
    ),
    $array
);
var_export($array);

或

usort()

：（演示）

$priority0 = array_flip(['new', 'old', 'other']);
$priority1 = array_flip(['NFL', 'MLB']);
usort(
    $array,
    fn($a, $b) => ($priority0[$a[0]] ?? PHP_EOL) <=> ($priority0[$b[0]] ?? PHP_EOL)
        ?: ($priority1[rtrim($a[1], '0..9')] ?? PHP_EOL) <=> ($priority1[rtrim($b[1], '0..9')] ?? PHP_EOL)
);
var_export($array);