Basic WP plugin to send RTA (Restricted To Adults) voluntary content label

awm-rta-label.php

<?php
declare(strict_types=1);

/**
 * Plugin Name: AWM RTA Label
 * Plugin URI:  https://gist.github.com/AliceWonderMiscreations/e65bb21f0d6c9c6842f0a535837077ec
 * Description: Globally enables RTA Label on a WordPress Blog. Enable this plugin, and it is done. Disable plugin to undo.
 * Version:     2112
 * Author:      Alice Wonder Miscreations
 * Author URI:  https://github.com/AliceWonderMiscreations/
 * License:     MIT
 * Licens URI:  https://opensource.org/licenses/MIT
 *
 * @package AWonderPHP/RTALabel
 * @author  Alice Wonder <[email protected]>
 * @license https://opensource.org/licenses/MIT MIT
 * @link    https://gist.github.com/AliceWonderMiscreations/e65bb21f0d6c9c6842f0a535837077ec
 */

function awm_rta_header() {
    header('Rating: RTA-5042-1996-1400-1577-RTA');
}

function awm_rta_meta() {
    echo "<meta name=\"RATING\" content=\"RTA-5042-1996-1400-1577-RTA\" />\n";
}

add_action('send_headers', 'awm_rta_header');
add_action('wp_head', 'awm_rta_meta');

?>