从多维数组中移除所有的叶子

Question

如何从多维数组中删除所有叶子?

这段代码给了我所有的叶子，我正在寻找相反的结果:

$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
foreach($iterator as $key => $value) {
    $result[] = array($key, $value);
}

是否有内置的?或者任何其他优雅的解决方案?

Answer 1

ParentIterator可以帮助您。

<?php
$array = [
    'a',
    'b'=>[
        'c'=>[],
        'd'
    ],
    'e',
    'f'=>[
        'g'=>[
            'h',
            'i'=>[
                'j'=>[],
                'k'
            ]
        ]
    ]
];
$rii = new RecursiveIteratorIterator(
    new ParentIterator(
        new RecursiveArrayIterator($array)
    ),
    RecursiveIteratorIterator::CHILD_FIRST
);
$result = [];
foreach($rii as $key => $dummy) {
    echo $key, "rn";
}

打印

c
b
j
i
g
f