PHP カスタム関数を使用して配列の交差と結合の機能を拡張する

function custom_array_intersect(array $array1, array $array2, $key_or_value = 'key')
{
    $result = [];
    foreach ($array1 as $key => $value) {
        if ($key_or_value == 'key') {
            if (array_key_exists($key, $array2)) {
                $result[$key] = $array1[$key];
            }
        } else {
            if (in_array($value, $array2)) {
                $result[$key] = $array1[$key];
            }
        }
    }
    return $result;
}

function custom_array_union(array $array1, array $array2, $key_or_value = 'key')
{
    $result = [];
    foreach ($array1 as $key => $value) {
        $result[$key] = $array1[$key];
    }
    foreach ($array2 as $key => $value) {
        if ($key_or_value == 'key') {
            if (!array_key_exists($key, $result)) {
                $result[$key] = $array2[$key];
            }
        } else {
            if (!in_array($value, $result)) {
                $key_to_use = array_search($value, $array1);
                if ($key_to_use !== false) {
                    $result[$key_to_use] = $array2[$key];
                } else {
                    $new_key = max(array_keys($result)) + 1;
                    $result[$new_key] = $array2[$key];
                }
            }
        }
    }
    return $result;
}

$array1 = ['a' => 1, 'b' => 2, 'c' => 3];
$array2 = ['b' => 4, 'c' => 5, 'd' => 6];

$result = custom_array_intersect($array1, $array2, 'key');
print_r($result); // 输出： ['b' => 4, 'c' => 5]

$array1 = ['a' => 1, 'b' => 2, 'c' => 3];
$array2 = ['b' => 4, 'd' => 5, 'e' => 6];

$result = custom_array_union($array1, $array2, 'key');
print_r($result); // 输出： ['a' => 1, 'b' => 4, 'c' => 3, 'd' => 5, 'e' => 6]