user_settings.php

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<?php
function _elgg_set_user_password() {
    $current_password = get_input('current_password', null, false);
    $password = get_input('password', null, false);
    $password2 = get_input('password2', null, false);
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if ($user && $password) {
        // let admin user change anyone's password without knowing it except his own.
        if (!elgg_is_admin_logged_in() || elgg_is_admin_logged_in() && $user->guid == elgg_get_logged_in_user_guid()) {
            $credentials = array(
                'username' => $user->username,
                'password' => $current_password
            );

            try {
                pam_auth_userpass($credentials);
            } catch (LoginException $e) {
                register_error(elgg_echo('LoginException:ChangePasswordFailure'));
                return false;
            }
        }

        try {
            $result = validate_password($password);
        } catch (RegistrationException $e) {
            register_error($e->getMessage());
            return false;
        }

        if ($result) {
            if ($password == $password2) {
                $user->salt = _elgg_generate_password_salt();
                $user->password = generate_user_password($user, $password);
                _elgg_services()->persistentLogin->handlePasswordChange($user, elgg_get_logged_in_user_entity());
                if ($user->save()) {
                    system_message(elgg_echo('user:password:success'));
                    return true;
                } else {
                    register_error(elgg_echo('user:password:fail'));
                }
            } else {
                register_error(elgg_echo('user:password:fail:notsame'));
            }
        } else {
            register_error(elgg_echo('user:password:fail:tooshort'));
        }
    } else {
        // no change
        return null;
    }

    return false;
}

function _elgg_set_user_name() {
    $name = strip_tags(get_input('name'));
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if (elgg_strlen($name) > 50) {
        register_error(elgg_echo('user:name:fail'));
        return false;
    }

    if ($user && $user->canEdit() && $name) {
        if ($name != $user->name) {
            $user->name = $name;
            if ($user->save()) {
                system_message(elgg_echo('user:name:success'));
                return true;
            } else {
                register_error(elgg_echo('user:name:fail'));
            }
        } else {
            // no change
            return null;
        }
    } else {
        register_error(elgg_echo('user:name:fail'));
    }
    return false;
}

function _elgg_set_user_language() {
    $language = get_input('language');
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if ($user && $language) {
        if (strcmp($language, $user->language) != 0) {
            $user->language = $language;
            if ($user->save()) {
                system_message(elgg_echo('user:language:success'));
                return true;
            } else {
                register_error(elgg_echo('user:language:fail'));
            }
        } else {
            // no change
            return null;
        }
    } else {
        register_error(elgg_echo('user:language:fail'));
    }
    return false;
}

function _elgg_set_user_email() {
    $email = get_input('email');
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if (!is_email_address($email)) {
        register_error(elgg_echo('email:save:fail'));
        return false;
    }

    if ($user) {
        if (strcmp($email, $user->email) != 0) {
            if (!get_user_by_email($email)) {
                if ($user->email != $email) {

                    $user->email = $email;
                    if ($user->save()) {
                        system_message(elgg_echo('email:save:success'));
                        return true;
                    } else {
                        register_error(elgg_echo('email:save:fail'));
                    }
                }
            } else {
                register_error(elgg_echo('registration:dupeemail'));
            }
        } else {
            // no change
            return null;
        }
    } else {
        register_error(elgg_echo('email:save:fail'));
    }
    return false;
}

function _elgg_set_user_default_access() {

    if (!elgg_get_config('allow_user_default_access')) {
        return false;
    }

    $default_access = get_input('default_access');
    $user_guid = get_input('guid');

    if ($user_guid) {
        $user = get_user($user_guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
    }

    if ($user) {
        $current_default_access = $user->getPrivateSetting('elgg_default_access');
        if ($default_access !== $current_default_access) {
            if ($user->setPrivateSetting('elgg_default_access', $default_access)) {
                system_message(elgg_echo('user:default_access:success'));
                return true;
            } else {
                register_error(elgg_echo('user:default_access:failure'));
            }
        } else {
            // no change
            return null;
        }
    } else {
        register_error(elgg_echo('user:default_access:failure'));
    }

    return false;
}

function _elgg_user_settings_menu_setup() {
    $user = elgg_get_page_owner_entity();

    if (!$user) {
        return;
    }

    $params = array(
        'name' => '1_account',
        'text' => elgg_echo('usersettings:user:opt:linktext'),
        'href' => "settings/user/{$user->username}",
        'section' => 'configure',
        'contexts' => array('settings'),
    );
    elgg_register_menu_item('page', $params);
    $params = array(
        'name' => '1_plugins',
        'text' => elgg_echo('usersettings:plugins:opt:linktext'),
        'href' => "settings/plugins/{$user->username}",
        'section' => 'configure',
        'contexts' => array('settings'),
    );
    elgg_register_menu_item('page', $params);
    $params = array(
        'name' => '1_statistics',
        'text' => elgg_echo('usersettings:statistics:opt:linktext'),
        'href' => "settings/statistics/{$user->username}",
        'section' => 'configure',
        'contexts' => array('settings'),
    );
    elgg_register_menu_item('page', $params);
}

function _elgg_user_settings_page_handler($page) {
    global $CONFIG;

    if (!isset($page[0])) {
        $page[0] = 'user';
    }

    if (isset($page[1])) {
        $user = get_user_by_username($page[1]);
        elgg_set_page_owner_guid($user->guid);
    } else {
        $user = elgg_get_logged_in_user_entity();
        elgg_set_page_owner_guid($user->guid);
    }

    elgg_push_breadcrumb(elgg_echo('settings'), "settings/user/$user->username");

    switch ($page[0]) {
        case 'statistics':
            elgg_push_breadcrumb(elgg_echo('usersettings:statistics:opt:linktext'));
            $path = $CONFIG->path . "pages/settings/statistics.php";
            break;
        case 'plugins':
            elgg_push_breadcrumb(elgg_echo('usersettings:plugins:opt:linktext'));
            $path = $CONFIG->path . "pages/settings/tools.php";
            break;
        case 'user':
            $path = $CONFIG->path . "pages/settings/account.php";
            break;
    }

    if (isset($path)) {
        require $path;
        return true;
    }
    return false;
}

function _elgg_user_settings_init() {
    elgg_register_page_handler('settings', '_elgg_user_settings_page_handler');

    elgg_register_event_handler('pagesetup', 'system', '_elgg_user_settings_menu_setup');

    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_language');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_password');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_default_access');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_name');
    elgg_register_plugin_hook_handler('usersettings:save', 'user', '_elgg_set_user_email');

    elgg_register_action("usersettings/save");

    // extend the account settings form
    elgg_extend_view('forms/account/settings', 'core/settings/account/name', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/password', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/email', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/language', 100);
    elgg_extend_view('forms/account/settings', 'core/settings/account/default_access', 100);
}

elgg_register_event_handler('init', 'system', '_elgg_user_settings_init');