PHP - 递归多维数组的迭代器 [英] PHP - Recursive Multidimension Array iterator

问题描述

我想写一个递归迭代器阵列功能，其中函数将返回设置由'$针规定的所有集合的结果。其中$ =针键

I'm trying to write a recursive array iterator function in which the function will return a result set of all sets that are specified by '$needle'. Where $needle = key

下面是我的功能：

function recursive($needle, $array, $holder = array()) {
    foreach ($array as $key => $value) {
        if (gettype($value) == 'array') {
            if ($key != $needle) {
                recursive($needle, $value);
            } elseif ($key == $needle) {
                if (!empty($value)) {
                    array_push($holder, $value);
                }
            }
        }
    }
    return $holder;
}

但我不会让所有的结果返回，而是得到了几个空的结果，如果我不指定！空（$值），虽然输入数组没有任何空集。我在做什么错了？

But I'm not getting all the results back and instead get a few empty results, if I don't specify the !empty($value), although the input array does not have any empty sets. What am I doing wrong?

推荐答案

您不必推倒重来，因为PHP有​​标准的递归迭代 API：

You don't need to reinvent the wheel since PHP has standard Recursive Iterator API:

//$array is your multi-dimensional array
$result   = [];
$search   = 'foo';
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array)); 
foreach($iterator as $key=>$value)
{
   if($search==$key && $value!=='')
   {
      $result[] = $value;
   }
}

- 注意，是因为你正在寻找价值的按键的 - 在通常情况下 $值将持有整个小节

-note, that, since you're searching for value by key - in common case $value will hold entire subsection.

如果你想这样做，在你自己的递归函数，这里有一个：

If you want to do this in your own recursive function, here's one:

function recursive($needle, $array, $holder = []) 
{
    $holder = [];
    foreach($array as $key=>$value)
    {
       if($key===$needle && $value!=='')
       {
          $holder = array_merge($holder, [$value]);
       }
       if(is_array($value))
       {
          $holder = array_merge($holder, recursive($needle, $value, $holder));
       }
    }
    return $holder;
}

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