获取与PHP中特定值匹配的多注意数组的所有键

Question

我有一个数组：

$transfers =
    Array
    (
        [0] => Array
            (
                [agency_to_id] => 8
                [agency_name] => 3.1 SUCURSAL BRASILIA
                [product_id] => 415
                [product_code] => 111021
                [product_name] => PAN FELIPE POR KILO
                [ptype_id] => 54
                [ptype_name] => 1.1.01.1 PANADERIA X KILO
                [catalog_id] => 1
                [subject_id] => 3
                [label_id] => 300000002
                [total_quantity] => 12
            )

        [1] => Array
            (
                [agency_to_id] => 9
                [agency_name] => 4.1 SUCURSAL CENTRO
                [product_id] => 415
                [product_code] => 111021
                [product_name] => PAN FELIPE POR KILO
                [ptype_id] => 54
                [ptype_name] => 1.1.01.1 PANADERIA X KILO
                [catalog_id] => 1
                [subject_id] => 3
                [label_id] => 300000002
                [total_quantity] => 8
            )

        [2] => Array
            (
                [agency_to_id] => 8
                [agency_name] => 3.1 SUCURSAL BRASILIA
                [product_id] => 416
                [product_code] => 111024
                [product_name] => GALLETA POR KILO
                [ptype_id] => 54
                [ptype_name] => 1.1.01.1 PANADERIA X KILO
                [catalog_id] => 1
                [subject_id] => 3
                [label_id] => 300000002
                [total_quantity] => 1.6
            )

        [3] => Array
            (
                [agency_to_id] => 8
                [agency_name] => 3.1 SUCURSAL BRASILIA
                [product_id] => 418
                [product_code] => 111028
                [product_name] => PAN INTEGRAL POR KILO
                [ptype_id] => 54
                [ptype_name] => 1.1.01.1 PANADERIA X KILO
                [catalog_id] => 1
                [subject_id] => 3
                [label_id] => 300000002
                [total_quantity] => 200
            )
    )

我想得到这个数组中匹配一个特定子数组值的所有键，例如，我想得到匹配[product_id] => 415的键，我应该得到键0和1。

我试过用array_keys，但它不起作用。

编辑：

foreach ($transfers $key => $transfer) {
                     $found_keys = array_keys($transfers, $transfer['product_id']);
                }

所以，你的答案，是一个空数组

 foreach ($transfers $key => $transfer) {
                        $filteredKeys = array_keys(array_filter($transfers, 
                                        function($item) { 
                                           return $item['product_id'] === $transfer['product_id'];
                                         }));
                    }

你能帮帮我吗。谢谢

Answer 1

编辑后：

$found_keys = array();
foreach ($transfers as $key => $transfer) {
  if ($transfer['product_id'] === 415) $found_keys[] = $key;
}

以下是最初所述问题的解决办法：

像这样使用array_filter：

$filtered = array_filter($transfers, 
                         function($item) { 
                            return $item['product_id'] === 415;
                         });

要获得所有匹配的元素，请完成。

若要只获取密钥，请将结果传递给array_keys

$filteredKeys = array_keys(array_filter($transfers, 
                                        function($item) { 
                                           return $item['product_id'] === 415;
                                         }));

这是可行的，因为array_filter在结果数组中保留了源数组的键。

Answer 2

听起来像是foreach的工作

$found_keys = array();
foreach($transfers as $transfer){
    if($transfer['product_id'] == 415){
         array_push($found_keys, $transfer);
    }
}

Answer 3

使用带有搜索参数的array_column和array_keys。下面是它如何工作的示例：

$products = array(
    0 => array('product_id'=>3),
    1 => array('product_id'=>4),
    2=> array('product_id'=>3)
);              

$keys = array_keys(array_column($products, 'product_id'), 3);
// outputs the key of the element that has `product_id` = 3
var_dump($keys);