请问：PHP中，怎么获取提交的二维数组中某几列键值不为空的结果

Array
(
    [name] => Array
        (
            [0] => 地砖
            [1] => 
            [2] => 空心砖
            [3] => 地砖
        )

    [cunit] => Array
        (
            [0] => 块
            [1] => 
            [2] => 块
            [3] => 块
        )

    [unitprice] => Array
        (
            [0] => 35
            [1] => 
            [2] => 3.5
            [3] => 35
        )

    [pronum] => Array
        (
            [0] => 2
            [1] => 
            [2] => 2
            [3] => 
        )

    [summoney] => Array
        (
            [0] => 
            [1] => 
            [2] => 
            [3] => 
        )

)

			$data=$_POST['sale'];
			//print_r($data);

			foreach ($data as $k1 => $v1) {
				foreach ($v1 as $k2 => $v2) {
					$new_data[$k2][$k1] = $v2;
					$new_data[$k2]['username']='admin';
				}
			}

$arr=array
(
    'name' => array
        (
            0 =>'地砖',
            1 =>'',
            2 => '空心砖',
            3 => '地砖',
        ),
    'cunit' => array
        (
            0 => '块',
            1 => '',
            2 => '块',
            3 => '块'
        ),
 
    'unitprice' => array
        (
            0 => 35,
            1 => '',
            2 => 3.5,
            3 => 35
        ),
 
  'pronum' => array
       (
            0 => 2,
            1 => '',
            2 => 2,
            3 =>''
        ),
   'summoney' => array
        (
            0 =>'', 
            1 =>'',