如何利用PHP計算數組的差異

$array1 = [1, 2, 3, 4, 5];
$array2 = [2, 3, 5, 6, 7];

$diff = array_diff($array1, $array2);
print_r($diff);

$array1 = ['a' => 1, 'b' => 2, 'c' => 3];
$array2 = ['a' => 1, 'b' => 5, 'c' => 3];

$diff = array_diff_assoc($array1, $array2);
print_r($diff);

Array
(
    [b] => 2
)

function array_diff_custom($array1, $array2) {
    $diff = [];
    foreach ($array1 as $key => $value) {
        if (!in_array($value, $array2)) {
            $diff[$key] = $value;
        }
    }
    return $diff;
}

$array1 = [1, 2, 3, 4, 5];
$array2 = [2, 3, 5, 6, 7];

$result = array_diff_custom($array1, $array2);
print_r($result);