PHP中一个多维数组的交集

$array1 = [
    'a' => ['id' => 1, 'name' => 'Alice'],
    'b' => ['id' => 2, 'name' => 'Bob']
];

$array2 = [
    'b' => ['id' => 2, 'name' 'Bob'],
    'c' => ['id' => 3, 'name' => 'Charlie']
];

// 使用array_intersect_assoc()找出交集
$intersection = array_intersect_assoc($array1, $array2);

print_r($intersection);

Array
(
    [b] => Array
        (
            [id] => 2
            [name] => Bob
        )
)

function compareById($a, $b) {
    return $a['id'] <=> $b['id'];
}

$intersectionById = array_uintersect_assoc($array1, $array2, 'compareById');

print_r($intersectionById);

Array
(
    [b] => Array
        (
            [id] => 2
            [name] => Bob
        )
)