remove empty rows from array

Question

I want to remove empty rows from array in php, I used array_filter that gives perfect result. Here is my code which I have tried

$cars = array
  (
  array("Volvo",22,18),
  array("BMW",15,13),
  array("Saab",5,2),
  array("",'','')
  );

  $cars= array_filter(array_map('array_filter', $cars));

  echo "<pre>"; print_r($cars);

the output is following for above array is :-

Array
(
    [0] => Array
        (
            [0] => Volvo
            [1] => 22
            [2] => 18
        )

    [1] => Array
        (
            [0] => BMW
            [1] => 15
            [2] => 13
        )

    [2] => Array
        (
            [0] => Saab
            [1] => 5
            [2] => 2
        )

)

the output is perfect as it removed the empty rows, but when I create new array like below

$cars = array
  (
  array("Volvo",22,18),
  array("BMW",15,13),
  array("Saab",5,2),
  array("",54,'')
  );

in last array it remove the first and last column and keep it remain the 1 position column in the array. like below:-

Array
(
    [0] => Array
    (
        [0] => Volvo
        [1] => 22
        [2] => 18
    )

    [1] => Array
    (
        [0] => BMW
        [1] => 15
        [2] => 13
    )

    [2] => Array
    (
        [0] => Saab
        [1] => 5
        [2] => 2
    )

    [3] => Array
    (
        [1] => 54
    )

)

I only want to remove empty row not the column so array return should be like below

Array
(
    [0] => Array
        (
            [0] => Volvo
            [1] => 22
            [2] => 18
        )

    [1] => Array
        (
            [0] => BMW
            [1] => 15
            [2] => 13
        )

    [2] => Array
        (
            [0] => Saab
            [1] => 5
            [2] => 2
        )

    [3] => Array
        (
            [0] => ''
            [1] => 54
            [2] => ''
        )

)

Answer 1

Simple solution:

$cars = array
(
    array("Volvo",22,18),
    array("BMW",15,13),
    array("Saab",5,2),
    array("",'','')
);

// Here we `implode` all values of current subarray 
// and if this imploded string is empty - skip subarray
$cars = array_filter($cars, function($v) { return implode('', $v) !== ''; });
echo '<pre>', print_r($cars), '</pre>';