php递归解决一个问题

Question

function get_new_nums($days = 5)
{
    $custom_time = time() - 86400 * $days;
    $where['createtime > '] = $custom_time;
    $piano_nums = $this->yuepu_models->list_whrere($where, 'COUNT(1) AS nums');
    if ($piano_nums < 100)
    {
        get_new_nums($days + 5);
    }
    //echo $piano_nums.'<br>;
    return $piano_nums;
}
get_new_nums();

直接echo的话，显示如下
140
97
64
22
0
0
我想返回大于100的值，就是那个140，但是现在用这个方法搞不定，返回的是0。
请大家帮忙看下该如何解决，谢谢了！

Answer 1

function get_new_nums($days = 5)
{
    $custom_time = time() - 86400 * $days;
    $where['createtime > '] = $custom_time;
    $piano_nums = $this->yuepu_models->list_whrere($where, 'COUNT(1) AS nums');
    if ($piano_nums < 100)
    {
        $piano_nums = get_new_nums($days + 5);
    }
    //echo $piano_nums.'<br>;
    return $piano_nums;
}
get_new_nums();