chamilo-lms2/main/cron/add_gradebook_certificates.php

<?php
/* For licensing terms, see /license.txt */

/**
 * Adds gradebook certificates to gradebook_certificate table from users
 * who have achieved the requirements but have not reviewed them yet.
 *
 * @package chamilo.cron
 *
 * @author Imanol Losada <imanol.losada@beeznest.com>
 */
require_once __DIR__.'/../inc/global.inc.php';

/**
 * Get all categories and users ids from gradebook.
 *
 * @return array Categories and users ids
 */
function getAllCategoriesAndUsers()
{
    $table = Database::get_main_table(TABLE_MAIN_GRADEBOOK_RESULT);
    $jointable = Database::get_main_table(TABLE_MAIN_GRADEBOOK_EVALUATION);
    $joinStatement = ' JOIN '.$jointable.' ON '.$table.'.evaluation_id = '.$jointable.'.id';

    return Database::select(
        'DISTINCT '.$jointable.'.category_id,'.$table.'.user_id',
        $table.$joinStatement
    );
}

if ($categoriesAndUsers = getAllCategoriesAndUsers()) {
    foreach ($categoriesAndUsers as $categoryAndUser) {
        Category::generateUserCertificate(
            $categoryAndUser['category_id'],
            $categoryAndUser['user_id']
        );
    }
}