[PHP] Variables in array to int ?

[RedPillow]

I got this IF - FOREACH - THING here (I know that's a bit stupidly done ... adding "," to $num and removing it ...
My excuse is, that Im just a poor student with goal to someday become good at this kind of stuff and currently I don't care if there's something done stupidly ... cause if I ever try to fix that, it will not work):

Code: (php)

if (isset($_GET["num"])) { foreach
($_GET["num"] as $arvo) $num = $num . $arvo . ",";
$numchk[] = $num;}
$numchktostring = $numchk[0];
$num2 = explode(",", $numchktostring);

unset($num2[7]);
$validchk = count($num2);

Now, it somewhy gives me output like this (By var_dumping $num2):

Code: (php)

array(7) { [0]=>  string(1) "1" [1]=>  string(1) "2" [2]=>  string(1) "3" [3]=>  string(1) "4" [4]=>  string(1) "5" [5]=>  string(1) "6" [6]=>  string(1) "7" } 

As you can see, every single key is a string.
My guestion is plain simple; how to make those strings int?

I have this example-snippet here, but how do I use it to array? (loop preferred):

Code: (php)

      $str = "10";
      $num = (int)$str;

-- EDIT --

This seems to turn the variables to int, but it loses the avlue given to them before:

Code: (php)

$i = 0;
$a = 0;
While ($i < 7) {
$num2[$a] = (int)$num2[$a];
$i++;
$a++;
}

var_dump($num2) outputs now:

Code: (php)

array(7) { [0]=>  int(1) [1]=>  int(2) [2]=>  int(3) [3]=>  int(4) [4]=>  int(5) [5]=>  int(6) [6]=>  int(7) } 

[kyrathaba]

Rather than the following...

Code

$num = (int)$str;

...you need something like this...

Code

$num = intval($str);

The former looks more like casting in C#.