Question

I'm using print_r(array_unique($array, SORT_REGULAR)); on the array below but it does not work.

I'm trying to filter out the redundant data.

Notice that [Order] and its key value pairs are all the same. But [Transaction] and its key value pairs are unique.

I need to get the [Order] element data and combine it with the 3 different [Transaction] elements.

My array

Array
(
    [0] => Array
        (
            [Order] => Array
                (
                    [PO] => TR11214
                    [OrderID] => 242856952012
                )

            [Transaction] => Array
                (
                    [TransPO] => TR11211
                    [TransactionPrice] => 91.17
                )

        )

    [1] => Array
        (
            [Order] => Array
                (
                    [PO] => TR11214
                    [OrderID] => 242856952012
                )

            [Transaction] => Array
                (
                    [TransPO] => TR11212
                    [TransactionPrice] => 180.41
                )

        )

    [2] => Array
        (
            [Order] => Array
                (
                    [PO] => TR11214
                    [OrderID] => 242856952012
                )

            [Transaction] => Array
                (
                    [TransPO] => TR11213
                    [TransactionPrice] => 209.99
                )

        )

)

The final array I need will look something like this.

Array
(
    [Order] => Array
        (
            [PO] => TR11214
            [OrderID] => 242856952012
        )

    [Transaction] => Array
        (
            [0] => Array
                (
                    [TransPO] => TR11211
                    [TransactionPrice] => 91.17
                )

            [1] => Array
                (
                    [TransPO] => TR11212
                    [TransactionPrice] => 180.41
                )

            [2] => Array
                (
                    [TransPO] => TR11213
                    [TransactionPrice] => 209.99
                )

        )

)

I can flatten the original array and then use array_unique, but wanted to see if there is a better way to accomplish what I need.

my code:

$myarray = array(
    0 => array(
    "Order" => array("PO" => "TR11214", "OrderID" => 242856952012),
    "Transaction" => array("TransPO" => "TR11211", "TransactionPrice" => 91.17)
    ),
    1 => array(
    "Order" => array("PO" => "TR11214", "OrderID" => 242856952012),
    "Transaction" => array("TransPO" => "TR11212", "TransactionPrice" => 180.41)
    ),
    2 => array(
    "Order" => array("PO" => "TR11214", "OrderID" => 242856952012),
    "Transaction" => array("TransPO" => "TR11213", "TransactionPrice" => 209.99)
    )
);


print_r(array_unique($myarray, SORT_REGULAR));

Answer 1

如果要确定数组中Order元素有多少个唯一值，则需要将array_unique仅应用于Order元素，您可以使用array_column：

$unique_orders = count(array_unique(array_column($myarray, 'Order'), SORT_REGULAR));

您可以使用具有非唯一值的键列表来处理数组，以生成一个数组，而其他键则只有一个值：

$non_unique_keys = ['Transaction'];
$output = array();
foreach (array_keys($myarray[0]) as $key) {
    if (in_array($key, $non_unique_keys)) {
        $output[$key] = array_column($myarray, $key);
    }
    else {
        $output[$key] = $myarray[0][$key];
    }
}
print_r($output);

示例输出：

Array ( 
    [Order] => Array (
        [PO] => TR11214
        [OrderID] => 242856952012
    ) 
    [Sales Tax] => Array (
        [PO] => TR11214
        [SalesTaxAmount] => 0 
    )
    [Transaction] => Array (
        [0] => Array (
            [TransPO] => TR11211
            [TransactionPrice] => 91.17
        )
        [1] => Array (
            [TransPO] => TR11212
            [TransactionPrice] => 180.41
        )
        [2] => Array (
            [TransPO] => TR11213
            [TransactionPrice] => 209.99
        )
    )
)

Demo on 3v4l.org

Answer 2

array_unique()用于一维数组。如果要在多维数组上使用它，则应考虑改为使用usort()。然后，您需要手动反向反向遍历数组，搜索重复项并将其删除。

PHP Array Unique Sort Regular not working as expected

2 个答案: