php与mysql分页问题，为什么别的界面都能用单独这个的下一页不能用，这么写有问题，该怎样修改

function get_links_list_all($key)
{
$result = get_filter();
if ($result === false)
{
$filter = array();
$filter['sort_by'] = empty($_REQUEST['sort_by']) ? 'user_id' : trim($_REQUEST['sort_by']);
$filter['sort_order'] = empty($_REQUEST['sort_order']) ? 'DESC' : trim($_REQUEST['sort_order']);
$sql = 'SELECT COUNT(*) FROM ' .$GLOBALS['ecs']->table('users')." WHERE employee_key='$key'";
$filter['record_count'] = $GLOBALS['db']->getOne($sql);

    $filter = page_and_size($filter);



   $sql  = 'SELECT * FROM ' .$GLOBALS['ecs']->table('users').
            " WHERE employee_key='$key'";
    set_filter($filter, $sql);
}
else
{
    $sql    = $result['sql'];
    $filter = $result['filter'];
}
$res = $GLOBALS['db']->selectLimit($sql, $filter['page_size'], $filter['start']);
$list = array();
while ($rows = $GLOBALS['db']->fetchRow($res))
{
    date_default_timezone_set('PRC');
    $rows['reg_time']=date('Y-m-d H:i:s',$rows['reg_time']);
    $list[] = $rows;
}
return array('list' => $list, 'filter' => $filter, 'page_count' => $filter['page_count'], 'record_count' => $filter['record_count']);

}