Description:
------------
the default function array_diff returns empty records in some cases. i have two arrays

1) (1),(3),(7),(9)
2) (2),(3)

it must return r) (1), (7), (9), but it returns (), (), (9)

i made a similar function by my self, and i had the same problem, then i review the code, and i found a line, a simple counter:

    if ($l_existe == false){
      <b>$arr_result[$i]</b> = $st_valorComparado;
      $i_result++;
    }

the var $i must be $i_result, that's why the array contains in somecases, in which the number of found elements is less than the max elements, the empty recs, because $arr_result[$i] is putting the value of $st_valorComparado in another index higher than the max of elements found.

Maybe the code of the original funcion have a similar error.


Reproduce code:
---------------
function fcn_array_diff($arr_comparado, $arr_compararEn){
  $i_maxComparado = count($arr_comparado);
  $i_maxCompararEn = count($arr_compararEn);
  $arr_result[0] = "";
  $i_result = 0;

  for ($i=0; $i<$i_maxComparado; $i++){
    $st_valorComparado = chop($arr_comparado[$i]);
    $l_existe = false;

    for ($j=0; $j<$i_maxCompararEn; $j++){
      $st_valorCompararEn = chop($arr_compararEn[$j]);

      if ($st_valorComparado == $st_valorCompararEn){
        $l_existe = true;
        break;
      }
    }

    <b>if ($l_existe == false){
      $arr_result[$i_result] = $st_valorComparado;
      $i_result++;
    }</b>
  }

  return $arr_result;
}