Question

我有一个要简化的复杂数据。

此数组深度可能会更改，因为它是来自外部资源的动态数据。我想将所有具有键price的数组合并为一维数组。

我要转这个：

array(
    'first_name' => 'John',
    'last_name'  => 'Due',
    'product'    => array(
        'title'   => 'Product #1',
        'price'   => '90',
        'product' => array(
            'title'   => 'Product #2',
            'price'   => '90',
            'product' => array(
                'title' => 'Product #3',
                'price' => '90',
            ),
        ),
    ),
    'misc'       => array(
        'country' => 'United States',
        array(
            'product' => array(
                'title' => 'Product #4',
                'price' => '90',
            ),
        )
    ),
    array(
        'title' => 'Product #5',
        'price' => '90',
    )
);

对此：

array(
    array(
        'title' => 'Product #1',
        'price' => '90',
    ),
    array(
        'title' => 'Product #2',
        'price' => '90',
    ),
    array(
        'title' => 'Product #3',
        'price' => '90',
    ),
    array(
        'title' => 'Product #4',
        'price' => '90',
    ),
    array(
        'title' => 'Product #5',
        'price' => '90',
    ),
);

我认为一种简单的方法是使用array_walk_recursive，但是发现我无法访问父数组。

array_walk_recursive(
    $array,
    function( $value, $key ) {
        if ( 'price' === $key ) {
            // cannot access the parent array
        }
    }
);

Answer 1


$array = array(
    'first_name' => 'John',
    'last_name' => 'Duei',
    'product' => array(
        'title' => 'Product #1',
        'price' => '90',
        'product' => array(
            'title' => 'Product #2',
            'price' => '90',
            'product' => array(
                'title' => 'Product #3',
                'price' => '90',
            ),
        ),
    ),
    'misc' => array(
        'country' => 'United States',
        array(
            'product' => array(
                'title' => 'Product #4',
                'price' => '90',
            ),
        )
    ),
    array(
        'title' => 'Product #5',
        'price' => '90',
    )
);

function array_walk_recursive_full($array, $callback)
{
    if (!is_array($array)) return;

    foreach ($array as $key => $value) {
        $callback($value, $key);
        array_walk_recursive_full($value, $callback);
    }
}

$result = [];

array_walk_recursive_full(
    $array,
    function ($value, $key) use (&$result) {
        if (isset($value['price'])) {
            $result[] = [
                'title' => $value['title'],
                'price' => $value['price'],
            ];
        }
    }
);

print_r($result);

working code example here

将多维数组中的特定键合并为一维数组

1 个答案: