subscribe.php

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<?php
$entity_guid = (int) get_input('guid');
$user_guid = (int) get_input('user_guid', elgg_get_logged_in_user_guid());
$methods = (array) get_input('methods', []);
$type = get_input('type');
$subtype = get_input('subtype');
$action = get_input('action');

$forward_url = get_input('forward_url');
$show_success = (bool) get_input('show_success', true);

$entity = get_entity($entity_guid);
if (!$entity instanceof \ElggEntity) {
    return elgg_error_response(elgg_echo('error:missing_data'));
}

$user = get_user($user_guid);
if (!$user instanceof \ElggUser || !$user->canEdit()) {
    return elgg_error_response(elgg_echo('actionunauthorized'));
}

$display_name = $entity->getDisplayName() ?: elgg_echo('item');

if (!$entity->addSubscription($user->guid, $methods, $type, $subtype, $action)) {
    return elgg_error_response(elgg_echo('entity:subscribe:fail', [$display_name]));
}

$success_keys = [
    "entity:subscribe:{$entity->type}:{$entity->subtype}:success",
    "entity:subscribe:{$entity->type}:success",
    'entity:subscribe:success',
];

$message = '';
if ($show_success) {
    foreach ($success_keys as $success_key) {
        if (elgg_language_key_exists($success_key)) {
            $message = elgg_echo($success_key, [$display_name]);
            break;
        }
    }
}

return elgg_ok_response('', $message, $forward_url);