Response send

send.php

<?php

function send(Response $response) {
    if (headers_sent()) {
        return;
    }

    http_response_code($response->status);

    foreach ($response->headers as $key => $value) {
        if (is_array($value)) {
            foreach ($value as $content) {
                header($key . ': ' . $content, false);
            }
            continue;
        }

        header($key . ': ' . $value);
    }

    if ($response->body !== null) {
        file_put_contents('php://output', $response->body);
    }
}