subscriptions.php

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<?php
$guid = (int) get_input('guid');
$user = get_user($guid);

if (!$user || !$user->canEdit()) {
    return elgg_error_response(elgg_echo('actionunauthorized'));
}

$methods = elgg_get_notification_methods();
if (empty($methods)) {
    return elgg_error_response(elgg_echo('usersettings:notifications:subscriptions:save:fail'));
}

$subscriptions = (array) get_input('subscriptions', []);
if (empty($subscriptions)) {
    return elgg_error_response(elgg_echo('error:missing_data'));
}

$targets = elgg_get_entities([
    'guids' => array_keys($subscriptions),
    'limit' => false,
    'batch' => true,
]);

/* @var $target \ElggEntity */
foreach ($targets as $target) {
    $keys = $subscriptions[$target->guid];
    
    foreach ($keys as $key => $preferred_methods) {
        list (, $type, $subtype, $action) = array_pad(explode(':', $key), 4, null); // array_pad() is to prevent PHP notice undefined index in list()
        
        if (!is_array($preferred_methods)) {
            $preferred_methods = [];
        }
        
        foreach ($methods as $method) {
            if (in_array($method, $preferred_methods)) {
                $target->addSubscription($user->guid, $method, $type, $subtype, $action);
            } else {
                $target->removeSubscription($user->guid, $method, $type, $subtype, $action);
            }
        }
    }
}

return elgg_ok_response('', elgg_echo('usersettings:notifications:subscriptions:save:ok'));