如何将数组父亲的键与子元素的键交换

Question

我想用父元素的键交换子元素的键，可以吗？

代码：

$array = array(array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"), array("e"=>"purple","f"=>"cyan","g"=>"brown","h"=>"white"));

print_r($array);

这就是我想要做的：

感谢您的帮助

Answer 1

如果您的数组名为 $arrayOne，那么您可以创建 $arrayTwo（其中包含键的开关），如下所示：

<?php

  $arrayTwo = [];//initiating the array which will hold the solution
  foreach($arrayOne as $keyFather=>$valueFather)
  {
    $newKey = $valueFather[0];
    $arrayTwo = ($newKey => array());//giving child key to the original
                                     //position of the father key
                                     //and creating a new array inside

    $firstIteration = TRUE;//conditional which helps place the fathers
                           //key into the previous child key position

    //filling up the new array created:
    foreach($valueFather as $key=$otherValue)
    {
      $nextKey = $key;
      if ($firstIteration)//only iterates at the beginning of the loop
      {
        $firstIteration = FALSE;
        $nextKey = $keyFather;//giving father key to child key position
      }
      $arrayTwo[$newKey][$nextKey] = $otherValue;//saving results
    }
  }

?>

Answer 2

像这样：

<?php
$array = array(array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"), array("e"=>"purple","f"=>"cyan","g"=>"brown","h"=>"white"));

$new_array = array();
foreach( $array as $key => $value){
        foreach ( $value as $k => $v ){
                $new_array[$k] = $value;
                foreach ( $new_array[$k] as $k1 => $v1){
                        $new_array[$k][$key] = $v1;
                        unset($new_array[$k][$k1]);
                        break;
                }
                break;
        }
}

print_r($new_array);
?>

打印：

Array
(
    [a] => Array
        (
            [b] => green
            [c] => blue
            [d] => yellow
            [0] => red
        )

    [e] => Array
        (
            [f] => cyan
            [g] => brown
            [h] => white
            [1] => purple
        )

)

Answer 3

如果您只想将父键与 "child" 数组中的第一个键交换 - 这是使用 array_map、array_walk、array_shift、[=15 的解决方案=]、array_values 和 current 函数：

$keys = array_map("key", $array);

array_walk($array, function(&$v, $k){
    $value = current($v);
    array_shift($v);
    $v[$k] = $value;
    ksort($v, SORT_NATURAL);
});

$result = array_combine($keys, array_values($array));
print_r($result);

输出：

Array
(
    [a] => Array
        (
            [0] => red
            [b] => green
            [c] => blue
            [d] => yellow
        )

    [e] => Array
        (
            [1] => purple
            [f] => cyan
            [g] => brown
            [h] => white
        )
)

Answer 4

解决方法是：

首先获取子数组的第一个key
向数组追加一个新的子数组。
向子数组追加一个新元素。
从子数组中删除旧元素。
最后，删除旧的子数组。

所以你的代码应该是这样的：

$array = array(array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"), array("e"=>"purple","f"=>"cyan","g"=>"brown","h"=>"white"));

foreach($array as $key => $arr){
    $k = key($arr);  // get the first key of the subarray
    $array[$k] = $arr;  // append a new subarray to the array
    $array[$k][$key] = $arr[$k]; // apppend a new element to the subarray
    unset($array[$k][$k]); // delete the old element from the subarray
    unset($array[$key]); // delete the old subarray
}

// display $array
echo '<pre>';
print_r($array);
echo '</pre>';

这是Live Demo

如何将数组父亲的键与子元素的键交换

How to exchange a key from an array father with an key of child element

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