3

我想使用下面提供的另一个数组对以下数组进行排序。

例如。我有以下数组：

[note] => Array
(
   [0] => 'note1'
   [1] => 'note2'
   [2] => 'note3'
), 
[text] => Array
(
   [0] => 'text1'
   [2] => 'test3'
), 
[year] => Array
(
   [0] => '2002'
   [1] => '2000'
   [2] => '2011'
)

我有数组：

$sortBy = array('2011', '2000', '2002').

我想根据 $sortBy 数组的值对上面的数组进行排序。

期望的结果是：

[note] => Array
(
   [0] => 'note3'
   [1] => 'note2'
   [2] => 'note1'
), 
[text] => Array
(
   [0] => 'test3'
   [2] => 'text1'
), 
[year] => Array
( 
   [0] => '2011'
   [1] => '2000'
   [2] => '2002'
)
4

4 回答 4

3

你有一个数组：

$array = array(
    'note' => array('note1', 'note2', 'note3'),
    'text' => array('text1', 'text2', 'text3'),
    'year' => array('2002', '2000', '2011')
);

还有一些东西的顺序：

$sortBy = array('2011', '2000', '2002');
$sortOrder = $array['year'];

然后，您会发现需要如何对年份进行排序：

array_walk($sortOrder, function(&$v) use ($sortBy) {$v = array_search($v, $sortBy);});

然后根据该顺序对整个数组进行排序：

array_multisort($sortOrder, $array['note'], $array['text'], $array['year']);

完整示例：

$array = array(
    'note' => array('note1', 'note2', 'note3'),
    'text' => array('text1', 'text2', 'text3'),
    'year' => array('2002', '2000', '2011')
);
$sortBy = array('2011', '2000', '2002');
$sortOrder = $array['year'];
array_walk($sortOrder, function(&$v) use ($sortBy) {$v = array_search($v, $sortBy);});
array_multisort($sortOrder, $array['note'], $array['text'], $array['year']);

输出/演示：

Array(
    [note] => Array(
            [0] => note3
            [1] => note2
            [2] => note1
        )
    [text] => Array(
            [0] => text3
            [1] => text2
            [2] => text1
        )
    [year] => Array(
            [0] => 2011
            [1] => 2000
            [2] => 2002
        )
)

编辑：映射的变体，备用array_search：

$sortBy = array_flip(array('2011', '2000', '2002'));
$sortOrder = $array['year'];
array_walk($sortOrder, function(&$v) use ($sortBy) {$v = $sortBy[$v];});
array_multisort($sortOrder, $array['note'], $array['text'], $array['year']);

Edit2： PHP 5.2 包装成一个函数，完全参数化：

/**
 * @param array $array
 * @param string|int $by key/offset
 * @param array $order
 * @return array
 */
function array_multisort_by_order(array $array, $by, array $order)
{
    $order = array_flip($order);
    $params[] = $array[$by];
    foreach($params[0] as &$v) $v = $order[$v];
    foreach($array as &$v) $params[] = &$v; unset($v);
    call_user_func_array('array_multisort', $params);
    return $array;
}

// Usage:
array_multisort_by_order($array, 'year', array('2011', '2000', '2002'));
于 2012-06-13T20:10:00.697 回答
2

我会像这样为它创建一个函数：

function sort_by($arr, $sub, $order){
    // Create a map from old key to new key
    $value_kmap = array_flip($arr[$sub]);
    $sort_kmap = array_flip($order);
    foreach($order as $value)
        $kmap[$value_kmap[$value]] = $sort_kmap[$value];

    // Create your result array
    foreach($arr as $name => $sub_arr)
        foreach($kmap as $key => $new_key)
            if(isset($sub_arr[$key]))
                $result[$name][$new_key] = $sub_arr[$key];

    return $result;
}

该函数是通用的，没有引用year. 它以子数组的名称作为参数进行排序。你会像这样使用它：

$arr = array(
    'note' => array('note1', 'note2', 'note3'),
    'text' => array('text1', 'text3'),
    'year' => array('2002',  '2000',  '2011' )
);

print_r(sort_by($arr, 'year', array('2011', '2000', '2002')));

输出 [键盘]：

大批
(
    [注] => 数组
        (
            [0] => 注3
            [1] => 注2
            [2] => 注1
        )

    [文本] => 数组
        (
            [1] => 文本3
            [2] => 文本1
        )

    [年份] => 数组
        (
            [0] => 2011
            [1] => 2000
            [2] => 2002
        )

)
于 2012-06-13T19:32:53.143 回答
0

我将您的数组命名为 $haystack 排序。

$newArray = array(); // not necessary, but starts your new array
// you know how you want to sort it, so loop through your sorting array
foreach( $sortBy as $year ){ 
   // get the key of the 2nd level of the 2D array, which we are saving as $k
   foreach( $haystack['year'] as $key => $value ){
      if( $value == $year ) $k = $key;
      break; // since we got what we need, we don't need to let this foreach loop finish
      // you could also do an array_search() here instead of this foreach
   }
   if( $k > 0 ){
      // if k is 0, we didn't find that value so we're not going to sort it or include it in the new array
      foreach( $haystack as $key => $a ){ 
         // just save it into a new array
         $newArray[$key][$k] = $a;       
      }
   }
}
var_dump( $newArray );
于 2012-06-13T19:22:49.757 回答
0

未经测试（当您发布这些有点问题时，您应该提供数组的 var_export() ）

//$orig = ...

$sorted = array();

$map = array_flip($orig['year']);
foreach ($sortBy as $year) {
    $originalNumerickey = $map[$year];
    foreach ($orig as $stringKey => $subArray) {
        $sorted[$stringKey][$originalNumerickey] = $subArray[$originalNumerickey];
    }
}
于 2012-06-13T19:33:37.863 回答