thinkphp 筛选条件查询

如果前台提交的条件为空，要把这个数组的键清掉

类似于:

Array
(
    [ypnum] => 
    [sbname] => 
    [mjnum] => 
    [mjnum2] => 
    [bm] => 
    [zrr] => 
    [type] => 1
)

清空掉后：

Array
(
    [type] => 1
)

代码：

                $where = $_POST;
                //删除空值的数组的键
                foreach ($where as $key=>$value)
                {
                    if(empty($value)){
                        unset($where[$key]);
                    }
                }