Question: I have the code : 

```
   function insertChamado($id, $area = 2)
   {

   if ($area != 2 && $area != 4)
    $area = 2;

```

How Can I adjust this code to not accept 0 condition as show in the log bellow :

```
[12-May-2016 16:58:28 America/Sao_Paulo] id = 36445, area = 0
[12-May-2016 16:59:00 America/Sao_Paulo] id = 14635, area = 0
[12-May-2016 17:00:02 America/Sao_Paulo] id = 18599, area = 0

```

Answer: 
Just add a conditional to check for it... Not sure what is hard about it unless we are missing something.

```
   function insertChamado($id, $area = 2)
   {
       if ($area == 0) die("Ruh-Rohh");
       if ($area != 2 && $area != 4)
           $area = 2;
   }

```

Or if you expect it to be 2 if it is 0:

```
   function insertChamado($id, $area = 2)
   {
       if (($area != 2 && $area != 4) || $area == 0) // Though || $area == 0 actually does nothing here as 0 already meets the previous condition.
           $area = 2;
   }

```

It occurs to me after the fact, that $area could never be 0 even in your original code as 0 != 2 and 0 != 4 thus $area = 2. I suspect an implementation issue, if this does not help I suggest you edit your ques to include more code.

Could be a scope issue, as you are not using a global $area and are not returning a value, the changed $area may not be breaking out of the function.

Try one of the se implementations:

Using global

```
$area = 0; // for testing only
function insertChamado($id)
{
    global $area;
    if ($area != 2 && $area != 4)
        $area = 2;
}

```

Or using a return:

```
$area = insertChamado(0,0);
function insertChamado($id, $area = 2)
{
    if ($area != 2 && $area != 4)
        $area = 2;
    return $area;
}

```

The incomplete code you supplied does not help as I have no idea what the implementation of `id` is.
After reading carefully your question i think that your best solution is a simple `switch`.

```
function insertChamado($id, $area = 2){
    switch ($area) {
        case 2:
            echo "area equals 2\n";
            break;
        case 4:
            echo "area equals 4\n";
            break;
        default:
            echo "area is always 2 other wise\n";
    }
}

insertChamado('id',0); // will output "area is always 2 other wise"

insertChamado('id'); // will output "area equals 2"

```