save.php

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<?php
$params = get_input('params');
$plugin_id = get_input('plugin_id');
$user_guid = get_input('user_guid', elgg_get_logged_in_user_guid());
$plugin = elgg_get_plugin_from_id($plugin_id);
$user = get_entity($user_guid);

if (!($plugin instanceof ElggPlugin)) {
    register_error(elgg_echo('plugins:usersettings:save:fail', array($plugin_id)));
    forward(REFERER);
}

if (!($user instanceof ElggUser)) {
    register_error(elgg_echo('plugins:usersettings:save:fail', array($plugin_id)));
    forward(REFERER);
}

$plugin_name = $plugin->getManifest()->getName();

// make sure we're admin or the user
if (!$user->canEdit()) {
    register_error(elgg_echo('plugins:usersettings:save:fail', array($plugin_name)));
    forward(REFERER);
}

$result = false;

if (elgg_action_exists("$plugin_id/usersettings/save")) {
    action("$plugin_id/usersettings/save");
} else {
    foreach ($params as $k => $v) {
        // Save
        $result = $plugin->setUserSetting($k, $v, $user->guid);

        // Error?
        if (!$result) {
            register_error(elgg_echo('plugins:usersettings:save:fail', array($plugin_name)));
            forward(REFERER);
        }
    }
}

system_message(elgg_echo('plugins:usersettings:save:ok', array($plugin_name)));
forward(REFERER);