根据其中一个匹配项拉出数组的元素[重复]

Question

我有两个数组：

$productIds = [
    ['product_id' => 12, 'price' => 1234],
    ['product_id' => 13, 'price' => 1235],
    ['product_id' => 14, 'price' => 1236]
];

$ids = [12, 14];

然后我迭代数组 $ids 并且必须从数组 $productIds 按产品 ID 提取我需要的数组：

$data = [];
foreach ($ids as $id) {
    $data[] = ... // get data by $id (equal 'product_id') from $productIds
}

在输出时，我想得到这样一个数组：

$data = [
    ['product_id' => 12, 'price' => 1234],
    ['product_id' => 14, 'price' => 1236]
];

但解决方案必须没有嵌套循环（foreach）。

Answer 1

你可以这样做，

        $productIds = array_column($productIds,null,"product_id");
        $result = [];
        foreach($ids as $id){
            $result[] = $productIds[$id];
        }