// if already using roles system
    if (has_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM))) {
        if (moodle_needs_upgrading()) {
            redirect($CFG->wwwroot . '/' . $CFG->admin . '/index.php');
        }
    } else {
        if (!empty($CFG->mymoodleredirect)) {
            // Redirect logged-in users to My Moodle overview if required
            if (isloggedin() && $USER->username != 'guest') {
                redirect($CFG->wwwroot . '/my/index.php');
            }
        }
    }
} else {
    // if upgrading from 1.6 or below
    if (isadmin() && moodle_needs_upgrading()) {
        redirect($CFG->wwwroot . '/' . $CFG->admin . '/index.php');
    }
}
if (get_moodle_cookie() == '') {
    set_moodle_cookie('nobody');
    // To help search for cookies on login page
}
if (!empty($USER->id)) {
    add_to_log(SITEID, 'course', 'view', 'view.php?id=' . SITEID, SITEID);
}
if (empty($CFG->langmenu)) {
    $langmenu = '';
} else {
    $currlang = current_language();
    $langs = get_list_of_languages();

/**
 * Execute cron tasks
 */
function cron_run()
{
    global $DB, $CFG, $OUTPUT;
    if (CLI_MAINTENANCE) {
        echo "CLI maintenance mode active, cron execution suspended.\n";
        exit(1);
    }
    if (moodle_needs_upgrading()) {
        echo "Moodle upgrade pending, cron execution suspended.\n";
        exit(1);
    }
    require_once $CFG->libdir . '/adminlib.php';
    require_once $CFG->libdir . '/gradelib.php';
    if (!empty($CFG->showcronsql)) {
        $DB->set_debug(true);
    }
    if (!empty($CFG->showcrondebugging)) {
        set_debugging(DEBUG_DEVELOPER, true);
    }
    set_time_limit(0);
    $starttime = microtime();
    // Increase memory limit
    raise_memory_limit(MEMORY_EXTRA);
    // Emulate normal session - we use admin accoutn by default
    cron_setup_user();
    // Start output log
    $timenow = time();
    mtrace("Server Time: " . date('r', $timenow) . "\n\n");
    // Run cleanup core cron jobs, but not every time since they aren't too important.
    // These don't have a timer to reduce load, so we'll use a random number
    // to randomly choose the percentage of times we should run these jobs.
    $random100 = rand(0, 100);
    if ($random100 < 20) {
        // Approximately 20% of the time.
        mtrace("Running clean-up tasks...");
        cron_trace_time_and_memory();
        // Delete users who haven't confirmed within required period
        if (!empty($CFG->deleteunconfirmed)) {
            $cuttime = $timenow - $CFG->deleteunconfirmed * 3600;
            $rs = $DB->get_recordset_sql("SELECT *\n                                             FROM {user}\n                                            WHERE confirmed = 0 AND firstaccess > 0\n                                                  AND firstaccess < ?", array($cuttime));
            foreach ($rs as $user) {
                delete_user($user);
                // we MUST delete user properly first
                $DB->delete_records('user', array('id' => $user->id));
                // this is a bloody hack, but it might work
                mtrace(" Deleted unconfirmed user for " . fullname($user, true) . " ({$user->id})");
            }
            $rs->close();
        }
        // Delete users who haven't completed profile within required period
        if (!empty($CFG->deleteincompleteusers)) {
            $cuttime = $timenow - $CFG->deleteincompleteusers * 3600;
            $rs = $DB->get_recordset_sql("SELECT *\n                                             FROM {user}\n                                            WHERE confirmed = 1 AND lastaccess > 0\n                                                  AND lastaccess < ? AND deleted = 0\n                                                  AND (lastname = '' OR firstname = '' OR email = '')", array($cuttime));
            foreach ($rs as $user) {
                if (isguestuser($user) or is_siteadmin($user)) {
                    continue;
                }
                delete_user($user);
                mtrace(" Deleted not fully setup user {$user->username} ({$user->id})");
            }
            $rs->close();
        }
        // Delete old logs to save space (this might need a timer to slow it down...)
        if (!empty($CFG->loglifetime)) {
            // value in days
            $loglifetime = $timenow - $CFG->loglifetime * 3600 * 24;
            $DB->delete_records_select("log", "time < ?", array($loglifetime));
            mtrace(" Deleted old log records");
        }
        // Delete old backup_controllers and logs.
        $loglifetime = get_config('backup', 'loglifetime');
        if (!empty($loglifetime)) {
            // Value in days.
            $loglifetime = $timenow - $loglifetime * 3600 * 24;
            // Delete child records from backup_logs.
            $DB->execute("DELETE FROM {backup_logs}\n                           WHERE EXISTS (\n                               SELECT 'x'\n                                 FROM {backup_controllers} bc\n                                WHERE bc.backupid = {backup_logs}.backupid\n                                  AND bc.timecreated < ?)", array($loglifetime));
            // Delete records from backup_controllers.
            $DB->execute("DELETE FROM {backup_controllers}\n                          WHERE timecreated < ?", array($loglifetime));
            mtrace(" Deleted old backup records");
        }
        // Delete old cached texts
        if (!empty($CFG->cachetext)) {
            // Defined in config.php
            $cachelifetime = time() - $CFG->cachetext - 60;
            // Add an extra minute to allow for really heavy sites
            $DB->delete_records_select('cache_text', "timemodified < ?", array($cachelifetime));
            mtrace(" Deleted old cache_text records");
        }
        if (!empty($CFG->usetags)) {
            require_once $CFG->dirroot . '/tag/lib.php';
            tag_cron();
            mtrace(' Executed tag cron');
        }
        // Context maintenance stuff
        context_helper::cleanup_instances();
        mtrace(' Cleaned up context instances');
        context_helper::build_all_paths(false);
//.........这里部分代码省略.........

                upgrade_core($version, true);
            }
        }
    }
} else {
    if ($version < $CFG->version) {
        // better stop here, we can not continue with plugin upgrades or anything else
        throw new moodle_exception('downgradedcore', 'error', new moodle_url('/admin/'));
    }
}
// Updated human-readable release version if necessary
if ($release != $CFG->release) {
    // Update the release version
    set_config('release', $release);
}
if (moodle_needs_upgrading()) {
    if (!$PAGE->headerprinted) {
        // means core upgrade or installation was not already done
        if (!$confirmplugins) {
            $strplugincheck = get_string('plugincheck');
            $PAGE->set_pagelayout('maintenance');
            $PAGE->set_popup_notification_allowed(false);
            $PAGE->navbar->add($strplugincheck);
            $PAGE->set_title($strplugincheck);
            $PAGE->set_heading($strplugincheck);
            $PAGE->set_cacheable(false);
            if ($fetchupdates) {
                // no sesskey support guaranteed here
                available_update_checker::instance()->fetch();
                redirect($PAGE->url);
            }

<link rel="stylesheet" type="text/css" href="style.css" media="screen">
<?php 
global $USER, $CFG;
require_once dirname(__FILE__) . '/../../config.php';
require_once $CFG->dirroot . '/my/lib.php';
include "connect.php";
redirect_if_major_upgrade_required();
$edit = optional_param('edit', null, PARAM_BOOL);
// Turn editing on and off
$reset = optional_param('reset', null, PARAM_BOOL);
require_login();
$hassiteconfig = has_capability('moodle/site:config', context_system::instance());
if ($hassiteconfig && moodle_needs_upgrading()) {
    redirect(new moodle_url('/admin/index.php'));
}
$strmymoodle = get_string('myhome');
if (isguestuser()) {
    // Force them to see system default, no editing allowed
    // If guests are not allowed my moodle, send them to front page.
    if (empty($CFG->allowguestmymoodle)) {
        redirect(new moodle_url('/', array('redirect' => 0)));
    }
    $userid = null;
    $USER->editing = $edit = 0;
    // Just in case
    $context = context_system::instance();
    $PAGE->set_blocks_editing_capability('moodle/my:configsyspages');
    // unlikely :)
    $header = "{$SITE->shortname}: {$strmymoodle} (GUEST)";
    $pagetitle = $header;
} else {

/**
 * Cron functions.
 *
 * @package    core
 * @subpackage admin
 * @copyright  1999 onwards Martin Dougiamas  http://dougiamas.com
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
function cron_run()
{
    global $DB, $CFG, $OUTPUT;
    if (CLI_MAINTENANCE) {
        echo "CLI maintenance mode active, cron execution suspended.\n";
        exit(1);
    }
    if (moodle_needs_upgrading()) {
        echo "Moodle upgrade pending, cron execution suspended.\n";
        exit(1);
    }
    require_once $CFG->libdir . '/adminlib.php';
    require_once $CFG->libdir . '/gradelib.php';
    if (!empty($CFG->showcronsql)) {
        $DB->set_debug(true);
    }
    if (!empty($CFG->showcrondebugging)) {
        $CFG->debug = DEBUG_DEVELOPER;
        $CFG->debugdisplay = true;
    }
    set_time_limit(0);
    $starttime = microtime();
    /// increase memory limit
    raise_memory_limit(MEMORY_EXTRA);
    /// emulate normal session
    cron_setup_user();
    /// Start output log
    $timenow = time();
    mtrace("Server Time: " . date('r', $timenow) . "\n\n");
    /// Session gc
    mtrace("Cleaning up stale sessions");
    session_gc();
    /// Run all cron jobs for each module
    mtrace("Starting activity modules");
    get_mailer('buffer');
    if ($mods = $DB->get_records_select("modules", "cron > 0 AND ((? - lastcron) > cron) AND visible = 1", array($timenow))) {
        foreach ($mods as $mod) {
            $libfile = "{$CFG->dirroot}/mod/{$mod->name}/lib.php";
            if (file_exists($libfile)) {
                include_once $libfile;
                $cron_function = $mod->name . "_cron";
                if (function_exists($cron_function)) {
                    mtrace("Processing module function {$cron_function} ...", '');
                    $pre_dbqueries = null;
                    $pre_dbqueries = $DB->perf_get_queries();
                    $pre_time = microtime(1);
                    if ($cron_function()) {
                        $DB->set_field("modules", "lastcron", $timenow, array("id" => $mod->id));
                    }
                    if (isset($pre_dbqueries)) {
                        mtrace("... used " . ($DB->perf_get_queries() - $pre_dbqueries) . " dbqueries");
                        mtrace("... used " . (microtime(1) - $pre_time) . " seconds");
                    }
                    /// Reset possible changes by modules to time_limit. MDL-11597
                    @set_time_limit(0);
                    mtrace("done.");
                }
            }
        }
    }
    get_mailer('close');
    mtrace("Finished activity modules");
    mtrace("Starting blocks");
    if ($blocks = $DB->get_records_select("block", "cron > 0 AND ((? - lastcron) > cron) AND visible = 1", array($timenow))) {
        // we will need the base class.
        require_once $CFG->dirroot . '/blocks/moodleblock.class.php';
        foreach ($blocks as $block) {
            $blockfile = $CFG->dirroot . '/blocks/' . $block->name . '/block_' . $block->name . '.php';
            if (file_exists($blockfile)) {
                require_once $blockfile;
                $classname = 'block_' . $block->name;
                $blockobj = new $classname();
                if (method_exists($blockobj, 'cron')) {
                    mtrace("Processing cron function for " . $block->name . '....', '');
                    if ($blockobj->cron()) {
                        $DB->set_field('block', 'lastcron', $timenow, array('id' => $block->id));
                    }
                    /// Reset possible changes by blocks to time_limit. MDL-11597
                    @set_time_limit(0);
                    mtrace('done.');
                }
            }
        }
    }
    mtrace('Finished blocks');
    //now do plagiarism checks
    require_once $CFG->libdir . '/plagiarismlib.php';
    plagiarism_cron();
    mtrace("Starting quiz reports");
    if ($reports = $DB->get_records_select('quiz_report', "cron > 0 AND ((? - lastcron) > cron)", array($timenow))) {
        foreach ($reports as $report) {
            $cronfile = "{$CFG->dirroot}/mod/quiz/report/{$report->name}/cron.php";
//.........这里部分代码省略.........

} else {
    if ($version < $CFG->version) {
        // better stop here, we can not continue with plugin upgrades or anything else
        throw new moodle_exception('downgradedcore', 'error', new moodle_url('/admin/'));
    }
}
// Updated human-readable release version if necessary
if (!$cache and $release != $CFG->release) {
    // Update the release version
    set_config('release', $release);
}
if (!$cache and $branch != $CFG->branch) {
    // Update the branch
    set_config('branch', $branch);
}
if (!$cache and moodle_needs_upgrading()) {
    if (!$PAGE->headerprinted) {
        // means core upgrade or installation was not already done
        if (!$confirmplugins) {
            $strplugincheck = get_string('plugincheck');
            $PAGE->navbar->add($strplugincheck);
            $PAGE->set_title($strplugincheck);
            $PAGE->set_heading($strplugincheck);
            $PAGE->set_cacheable(false);
            if ($fetchupdates) {
                require_sesskey();
                $updateschecker = \core\update\checker::instance();
                if ($updateschecker->enabled()) {
                    $updateschecker->fetch();
                }
                redirect($PAGE->url);

function mnetadmin_rpc_upgrade($user, $json_response = true)
{
    global $CFG, $USER;
    // Invoke local user and check his rights
    if ($auth_response = invoke_local_user((array) $user)) {
        if ($json_response) {
            return $auth_response;
        } else {
            return json_decode($auth_response);
        }
    }
    // Creating response
    $response = new stdclass();
    $response->status = RPC_SUCCESS;
    require "{$CFG->dirroot}/version.php";
    // defines $version, $release, $branch and $maturity
    $CFG->target_release = $release;
    // used during installation and upgrades
    if ($version < $CFG->version) {
        $response->status = RPC_FAILURE_RUN;
        $response->error = get_string('downgradedcore', 'error');
        $response->errors[] = get_string('downgradedcore', 'error');
        if ($json_response) {
            return json_encode($response);
        } else {
            return $response;
        }
    }
    $oldversion = "{$CFG->release} ({$CFG->version})";
    $newversion = "{$release} ({$version})";
    if (!moodle_needs_upgrading()) {
        $response->message = get_string('cliupgradenoneed', 'core_admin', $newversion);
        if ($json_response) {
            return json_encode($response);
        } else {
            return $response;
        }
    }
    // debug_trace('Remote Upgrade : Environment check');
    list($envstatus, $environment_results) = check_moodle_environment(normalize_version($release), ENV_SELECT_NEWER);
    if (!$envstatus) {
        $response->status = RPC_FAILURE_RUN;
        $response->error = vmoodle_get_string('environmentissues', 'vmoodleadminset_upgrade');
        $response->errors[] = vmoodle_get_string('environmentissues', 'vmoodleadminset_upgrade');
        $response->detail = $environment_results;
        if ($json_response) {
            return json_encode($response);
        } else {
            return $response;
        }
    }
    // Test plugin dependencies.
    // debug_trace('Remote Upgrade : Plugins check');
    $failed = array();
    if (!plugin_manager::instance()->all_plugins_ok($version, $failed)) {
        $response->status = RPC_FAILURE_RUN;
        $response->error = get_string('pluginschecktodo', 'admin');
        $response->errors[] = get_string('pluginschecktodo', 'admin');
        if ($json_response) {
            return json_encode($response);
        } else {
            return $response;
        }
    }
    ob_start();
    // debug_trace('Remote Upgrade : Upgrade core');
    if ($version > $CFG->version) {
        upgrade_core($version, false);
    }
    set_config('release', $release);
    set_config('branch', $branch);
    // unconditionally upgrade
    // debug_trace('Remote Upgrade : Upgrade other');
    upgrade_noncore(false);
    // log in as admin - we need doanything permission when applying defaults
    // debug_trace('Remote Upgrade : Turning ADMIN ');
    session_set_user(get_admin());
    // apply all default settings, just in case do it twice to fill all defaults
    // debug_trace('Remote Upgrade : Applying settings ');
    admin_apply_default_settings(NULL, false);
    admin_apply_default_settings(NULL, false);
    ob_end_clean();
    $response->message = vmoodle_get_string('upgradecomplete', 'vmoodleadminset_upgrade', $newversion);
    if ($json_response) {
        return json_encode($response);
    } else {
        return $response;
    }
}

/**
 * Execute cron tasks
 */
function cron_run()
{
    global $DB, $CFG, $OUTPUT;
    if (CLI_MAINTENANCE) {
        echo "CLI maintenance mode active, cron execution suspended.\n";
        exit(1);
    }
    if (moodle_needs_upgrading()) {
        echo "Moodle upgrade pending, cron execution suspended.\n";
        exit(1);
    }
    require_once $CFG->libdir . '/adminlib.php';
    if (!empty($CFG->showcronsql)) {
        $DB->set_debug(true);
    }
    if (!empty($CFG->showcrondebugging)) {
        set_debugging(DEBUG_DEVELOPER, true);
    }
    core_php_time_limit::raise();
    $starttime = microtime();
    // Increase memory limit
    raise_memory_limit(MEMORY_EXTRA);
    // Emulate normal session - we use admin accoutn by default
    cron_setup_user();
    // Start output log
    $timenow = time();
    mtrace("Server Time: " . date('r', $timenow) . "\n\n");
    // Run all scheduled tasks.
    while (!\core\task\manager::static_caches_cleared_since($timenow) && ($task = \core\task\manager::get_next_scheduled_task($timenow))) {
        mtrace("Execute scheduled task: " . $task->get_name());
        cron_trace_time_and_memory();
        $predbqueries = null;
        $predbqueries = $DB->perf_get_queries();
        $pretime = microtime(1);
        try {
            get_mailer('buffer');
            $task->execute();
            if ($DB->is_transaction_started()) {
                throw new coding_exception("Task left transaction open");
            }
            if (isset($predbqueries)) {
                mtrace("... used " . ($DB->perf_get_queries() - $predbqueries) . " dbqueries");
                mtrace("... used " . (microtime(1) - $pretime) . " seconds");
            }
            mtrace("Scheduled task complete: " . $task->get_name());
            \core\task\manager::scheduled_task_complete($task);
        } catch (Exception $e) {
            if ($DB && $DB->is_transaction_started()) {
                error_log('Database transaction aborted automatically in ' . get_class($task));
                $DB->force_transaction_rollback();
            }
            if (isset($predbqueries)) {
                mtrace("... used " . ($DB->perf_get_queries() - $predbqueries) . " dbqueries");
                mtrace("... used " . (microtime(1) - $pretime) . " seconds");
            }
            mtrace("Scheduled task failed: " . $task->get_name() . "," . $e->getMessage());
            if ($CFG->debugdeveloper) {
                if (!empty($e->debuginfo)) {
                    mtrace("Debug info:");
                    mtrace($e->debuginfo);
                }
                mtrace("Backtrace:");
                mtrace(format_backtrace($e->getTrace(), true));
            }
            \core\task\manager::scheduled_task_failed($task);
        }
        get_mailer('close');
        unset($task);
    }
    // Run all adhoc tasks.
    while (!\core\task\manager::static_caches_cleared_since($timenow) && ($task = \core\task\manager::get_next_adhoc_task($timenow))) {
        mtrace("Execute adhoc task: " . get_class($task));
        cron_trace_time_and_memory();
        $predbqueries = null;
        $predbqueries = $DB->perf_get_queries();
        $pretime = microtime(1);
        try {
            get_mailer('buffer');
            $task->execute();
            if ($DB->is_transaction_started()) {
                throw new coding_exception("Task left transaction open");
            }
            if (isset($predbqueries)) {
                mtrace("... used " . ($DB->perf_get_queries() - $predbqueries) . " dbqueries");
                mtrace("... used " . (microtime(1) - $pretime) . " seconds");
            }
            mtrace("Adhoc task complete: " . get_class($task));
            \core\task\manager::adhoc_task_complete($task);
        } catch (Exception $e) {
            if ($DB && $DB->is_transaction_started()) {
                error_log('Database transaction aborted automatically in ' . get_class($task));
                $DB->force_transaction_rollback();
            }
            if (isset($predbqueries)) {
                mtrace("... used " . ($DB->perf_get_queries() - $predbqueries) . " dbqueries");
                mtrace("... used " . (microtime(1) - $pretime) . " seconds");
            }
//.........这里部分代码省略.........