save.php

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<?php
$params = get_input('params');
$plugin_id = get_input('plugin_id');
$user_guid = (int) get_input('user_guid', elgg_get_logged_in_user_guid());
if (empty($plugin_id) || empty($user_guid)) {
    return elgg_error_response(elgg_echo('error:missing_data'));
}

$plugin = elgg_get_plugin_from_id($plugin_id);
$user = get_user($user_guid);
if (!$plugin || !$user || !$user->canEdit()) {
    return elgg_error_response(elgg_echo('plugins:usersettings:save:fail', [$plugin_id]));
}

$plugin_name = $plugin->getDisplayName();

$result = false;

foreach ($params as $name => $value) {
    $result = $user->setPluginSetting($plugin->getID(), $name, $value);
    if (!$result) {
        return elgg_error_response(elgg_echo('plugins:usersettings:save:fail', [$plugin_name]));
    }
}

return elgg_ok_response('', elgg_echo('plugins:usersettings:save:ok', [$plugin_name]));