cron.php

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<?php
function _elgg_cron_init() {
    elgg_register_page_handler('cron', '_elgg_cron_page_handler');

    elgg_register_plugin_hook_handler('cron', 'all', '_elgg_cron_monitor', 1000);

    elgg_set_config('elgg_cron_periods', array(
        'minute',
        'fiveminute',
        'fifteenmin',
        'halfhour',
        'hourly',
        'daily',
        'weekly',
        'monthly',
        'yearly',
        // reboot is deprecated and probably does not work
        'reboot',
    ));

    elgg_register_admin_menu_item('administer', 'cron', 'statistics');
}

function _elgg_cron_page_handler($page) {
    if (!isset($page[0])) {
        forward();
    }

    $period = strtolower($page[0]);

    $allowed_periods = elgg_get_config('elgg_cron_periods');

    if (!in_array($period, $allowed_periods)) {
        throw new \CronException("$period is not a recognized cron period.");
    }

    // Get a list of parameters
    $params = array();
    $params['time'] = time();

    // Data to return to
    $old_stdout = "";
    ob_start();

    $old_stdout = elgg_trigger_plugin_hook('cron', $period, $params, $old_stdout);
    $std_out = ob_get_clean();

    echo $std_out . $old_stdout;
    return true;
}

function _elgg_cron_monitor($hook, $period, $output, $params) {
    $time = $params['time'];
    $periods = elgg_get_config('elgg_cron_periods');

    if (in_array($period, $periods)) {
        $key = "cron_latest:$period:ts";
        elgg_get_site_entity()->setPrivateSetting($key, $time);
    }
}

return function(\Elgg\EventsService $events, \Elgg\HooksRegistrationService $hooks) {
    $events->registerHandler('init', 'system', '_elgg_cron_init');
};