请问，可以这样过滤 $_POST 请求吗？

循环过滤，但只获得了最后一条？-_-"

function request(string $key)
{
    $method = strtoupper($_SERVER['REQUEST_METHOD']);
    $data = [];

    if ($method === "GET") {
        foreach ($_GET as $key => $value) {
            $data[$key] = escape($value);
        }
    } elseif ($method === "POST") {
        foreach ($_POST as $key => $value) {
            $data[$key] = escape($value);
        }
    }

    return $data[$key];
}

输出结果：

Array
(
    [email] => 11111111
    [username] => 11111111
    [password] => 11111111
)