} else {
        echo json_encode(true);
        return;
    }
}
if ($check_allowed_users) {
    require_once 'include/functions_db.php';
    $user_id = get_parameter('user_id', '');
    $id_group = get_parameter('id_group', '');
    if ($user_id == '') {
        echo json_encode(true);
        return;
    }
    if ($id_group != '') {
        $filter['group'] = $id_group;
    } else {
        $filter = false;
    }
    //~ $query_users = users_get_allowed_users_query ($config['id_user'], false);
    $query_users = users_get_allowed_users_query($config['id_user'], $filter);
    $users = get_db_all_rows_sql($query_users);
    foreach ($users as $user) {
        if (preg_match('/^' . $user_id . '$/i', $user['id_usuario']) || preg_match('/^' . $user_id . '$/i', $user['nombre_real']) || preg_match('/^' . $user_id . '$/i', $user['num_employee'])) {
            echo json_encode(true);
            return;
        }
    }
    // Does not exist
    echo json_encode(false);
    return;
}
function users_get_users_owners_or_creators($id_user, $id_group = false)
{
    global $config;
    $values = array();
    if ($id_user === 0) {
        $id_user = $config['id_user'];
    }
    if ($id_group) {
        $query_users = "SELECT id_usuario FROM tusuario_perfil WHERE id_grupo = {$id_group} OR id_grupo = 0";
    } else {
        $query_users = users_get_allowed_users_query($id_user, false);
    }
    $users = get_db_all_rows_sql($query_users);
    if ($users == false) {
        $users = array();
    }
    foreach ($users as $user) {
        $values[$user['id_usuario']] = get_db_row_sql("SELECT id_usuario, nombre_real, num_employee FROM tusuario WHERE id_usuario = '" . $user['id_usuario'] . "'");
    }
    return $values;
}