php array_walk多維數組

Question

我有三個帶有某種分層預定義術語的數組

array("fruits", "yellow", "pineapple");
array("fruits", "yellow", "lemon");
array("fruits", "red", "apple");

我有一個關聯數組，它有一種層次結構：

array('fruits'=>array('red'=>array('tomato')));

如何在我得到的正確位置推送我的三個陣列的條款：

array('fruits'=>array('yellow'=>array('pineapple','lemon'),'red'=>array('tomato','apple')));

我使用array_walk嗎？ 還是array_walk_recursive？ 我該怎么用？

最好的，Joerg

Answer 1

您將每個水果轉換為嵌套數組，然后使用array_merge_recursive（）進行合並。

這是一個工作示例（ 也在Codepad上 ）：

$fruits = array(
  array("fruits", "yellow", "pineapple"),
  array("fruits", "yellow", "lemon"),
  array("fruits", "red", "apple"),
  array("fruits", "red", "tomato"),
);

// Convert array to nested array
function nest($leaf)
{
  if (count($leaf) > 1)
  {
    $key = array_shift($leaf);

    return array($key => nest($leaf));
  }
  else
  {
    return $leaf;
  }
}

$tree = array();

foreach($fruits as $fruit)
{
  // Convert each fruit to a nested array and merge recursively
  $tree = array_merge_recursive($tree, nest($fruit));
}

print_r($tree);

Answer 2

$fruits[] = array("fruits", "yellow", "pineapple");
$fruits[] = array("fruits", "yellow", "lemon");
$fruits[] = array("fruits", "red", "apple");

foreach($fruits as $fruit) {
  $multifruit[$fruit[0]][$fruit[1]][] = $fruit[2];
}

print_r($multifruit);

/* yields:
Array
(
    [fruits] => Array
        (
            [yellow] => Array
                (
                    [0] => pineapple
                    [1] => lemon
                )

            [red] => Array
                (
                    [0] => apple
                )

        )

)
*/

完全符合你的要求。 賦值左側的最后一個[]附加右側而不是覆蓋任何現有值（如果存在）。

Answer 3

<?php

$fruits[] = array("fruits", "yellow", "pineapple");
$fruits[] = array("fruits", "yellow", "lemon");
$fruits[] = array("fruits", "red", "apple");
$fruits[] = array("fruits", "blue", "small","blueberry");
$fruits[] = array("fruits", "blue", "bluefruit");
$fruits[] = array("fruits", "multicolor-fruit");

function deeper(&$multifruit, $fruit) {
    if (count($fruit)>2) {
        $shifted = array_shift($fruit);
        deeper($multifruit[$shifted], $fruit);
        return $multifruit;
    } else {
        return $multifruit[$fruit[0]][] = $fruit[1];
    }   
}   

foreach($fruits as $fruit) {
   deeper($multifruit, $fruit);
}   

print_r($multifruit);
?>  

在這里，您可以使用更一般的問題解決方案。 我花了一段時間，所以我希望你欣賞它:)