php array_walk 多维数组

Question

我得到了三个带有某种分层预定义术语的数组

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

我有一个具有层次结构的关联数组:

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

如何将我的三个数组的项推送到我得到的正确位置:

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

我是否使用 array_walk？还是 array_walk_recursive？我应该使用什么？

最好的，约尔格

Answer 1

您将每个水果转换为嵌套数组，然后使用 array_merge_recursive() 合并.

这是一个工作示例 ( also on Codepad ):

$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);