PHP數組搜索-如何在另一個數組中找到數組鍵的匹配項？

Question

如何在另一個數組中找到數組鍵的匹配項 ？

例如，

陣列1

Array
(
    [0] => Array
        (
            [parent_id] => 4 // the lookup key
            [count] => 7
        )

    [1] => Array
        (
            [parent_id] => 5 // the lookup key
            [count] => 2
        )

)

陣列2

Array
(
    [0] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
        )

    [1] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
            [parent_id] => 4 // the match 
        )

    [2] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
        )

    [3] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
            [parent_id] => 5 // the match 
        )

    [4] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
        )
)

結果是我追求

Array
(
    [0] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
            [parent_id] => 4
            [count] => 7
        )

    [1] => Array
        (
            [router] => xxx
            [path] => xxx
            [plugin] => xxx
            [parent_id] => 5
            [count] => 2
        )

)

Answer 1

嘗試這個 ..

array_column函數將從第二個數組返回parent_id，array_search函數將匹配array1和array2的兩個parent_id，而array_merge函數會將兩個數組與匹配的parent_id合並。

未經測試，因此請原諒任何小的語法錯誤。

$array1 = array(); // this is your first array in your example
$array2 = array(); // this is your second array in your example
$result = array(); // this is what you're looking for

foreach ($array1 as $row) {
  $result[] = array_merge($row, $array2[array_search($row["parent_id"], array_column($array2,"parent_id")];
}