Question

我有以下几组:

Array(
[1005] => Array(
               [1000] => Array(
                              [1101] => ...
                              [1111] => ...
                              )
               )
)

In my function I send $Id. And my task to return a array by this Id. For example: getArray(1000) should return the next array:

Array(
                                  [1101] => ...
                                  [1111] => ...
                                  )

我如何做到这一点? 感谢。

Answer 1

此处为<代码>getArray的重新应用:

function getArray($array, $index) {
    if (!is_array($array)) return null;
    if (isset($array[$index])) return $array[$index];
    foreach ($array as $item) {
        $return = getArray($item, $index);
        if (!is_null($return)) {
            return $return;
        }
    }
    return null;
}

此处是<代码>getArray的代用实施:

function getArray($array, $index) {
    $queue = array($array);
    while (($item = array_shift($queue)) !== null) {
        if (!is_array($item)) continue;
        if (isset($item[$index])) return $item[$index];
        $queue = array_merge($queue, $item);
    }
    return null;
}

Answer 2

使用recursive iterator:

function getArray($array, $index) {
    $arrayIt = new RecursiveArrayIterator($array);
    $it = new RecursiveIteratorIterator(
        $arrayIt, 
        RecursiveIteratorIterator::SELF_FIRST
    );
    foreach ($it as $key => $value) {
        if ($key == $index) {
            return $value;
        }
    }
    return null;
}

或者,如果你真的想要获得弹性,你可以使用。

class IndexFilterIterator extends FilterIterator {
    protected $index =   ;
    public function __construct($iterator, $index) {
        $this->index = $index;
        parent::__construct($iterator);
    }
    public function accept() {
        return parent::key() == $index;
    }
}

function getArray($array, $index) {
    $arrayIt = new RecursiveArrayIterator($array);
    $it = new RecursiveIteratorIterator(
        $arrayIt, 
        RecursiveIteratorIterator::SELF_FIRST
    );
    $filterIt = new IndexFilterIterator($it, $index);
    $filterIt->rewind();
    if ($filterIt->valid()) {
        return $filterIt->current();
    }
    return null;
}

友情链接