无法从多维数组中删除空键

Question

I am trying to delete array elements from an array using array_filter function. It's working fine but there is always ONE element that is not removed.

The array is constructed with array_combine using one simple array and other built with array_chunk.

Here is my code:

$arr_a = array("AAA","","CCC","");

$arr_b = array("a1","b1","a2","b2","a3","b3","a4","b4");

$arr_c = array_chunk($arr_b,2);

$c = array_combine($arr_a,$arr_c);

$limpn_url = array_filter($c);

If I'd get an error I would not bother to post here a question. But there is no error returning.

When making print_r($limpn_url); the output is: Array ( [AAA] => Array ( [0] => a1 [1] => b1 ) [] => Array ( [0] => a4 [1] => b4 ) [CCC] => Array ( [0] => a3 [1] => b3 ) )

*note the [] => Array ( [0] => a4 [1] => b4 ) That shouldn't be there. Other empty elements were deleted correctly...

Answer 1

You can use some array functions to remove keys that is empty.

$arr_a = array("AAA","","CCC","");

$arr_b = array("a1","b1","a2","b2","a3","b3","a4","b4");

$arr_c = array_chunk($arr_b,2);

$c = array_combine($arr_a,$arr_c);

$limp= array_filter($c);

$filteredkeys = array_filter(array_keys($limp)); // here i remove the "" key

$filtered = array_intersect_key($limp, array_flip($filteredkeys)); // since $filterdkeys is values i need to flip it and intersect with $limp
var_dump($filtered);

output:

array(2) {
  ["AAA"]=>
  array(2) {
    [0]=>
    string(2) "a1"
    [1]=>
    string(2) "b1"
  }
  ["CCC"]=>
  array(2) {
    [0]=>
    string(2) "a3"
    [1]=>
    string(2) "b3"
  }
}

https://3v4l.org/miNeW