retorna_logs.php

<?php

ini_set('memory_limit', '512M');
ini_set('date.timezone', "America/Sao_paulo");

require_once 'PdoFactory.php';
require_once 'Metadata.php';
$config = include_once 'config/cron_config.php';

function logsNulos($database)
{
    $sql = "SELECT
                    *
                FROM
                    log
                WHERE
                    id_course is null
                ";

    return $database->query($sql)->fetchAll(PDO::FETCH_ASSOC);
}

try {
    $database = PdoFactory::getInstance($config);

    $logsNulos = logsNulos($database);

    var_dump(count($logsNulos));
    
} catch (PDOException $pdoex) {
    echo $pdoex->getMessage();
} catch (Exception $ex) {
    echo $ex->getMessage();
}