PHP数组忽略重复值

Question

忽略此分组数组中的customer_name重复项的最佳方法是什么？我只想显示一个唯一名称列表。

Array
(
    [1] => Array
        (
            [0] => Array
                (
                    [model_id] => 1
                    [work_order] => 10999
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

            [1] => Array
                (
                    [model_id] => 1
                    [work_order] => 10998
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

        )
)

Answer 1

假设您仅关心唯一名称，而$arr是：

Array
(
    [1] => Array
        (
            [0] => Array
                (
                    [model_id] => 1
                    [work_order] => 10999
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

            [1] => Array
                (
                    [model_id] => 1
                    [work_order] => 10998
                    [id] => 1
                    [model_name] => STC1.5
                    [stock] => 3
                    [free] => 1
                    [customer_name] => Jane Doe
                )

        )
)

然后您可以使用：

$unique_names = array_keys(array_flip(array_column($arr[1],'customer_name')));

---

如果您担心微优化，请尝试：

$unique_names = array();

foreach( $arr[1] as $v )
{
    $unique_names[$v['customer_name']] = $v['customer_name'];
}

Answer 2

您可以使用名称为array_column的名称创建一个数组，并在其上使用array_unique。
然后使用array_intersect_key从主数组中获取相应的子数组。

$name = array_unique(array_column($arr[1], "customer_name"));
$unique = array_intersect_key($arr, $name);