Replacing Missing Array values

[Anon]

Hi,
I have a form that sends values (from 1-10), which are then imploded and separated by a ','. However, I need to be able to insert a ',' in place of a missing value: -
ie. if 1,2 and 3 are selected => 1,2,3 is returned
if 1,2,3 and 5 are selected => 1,2,3,,5 is returned.
The array can be up to 10, so if 1 and 10 are selected 1,,,,,,,,,10 is returned, etc.
I know it should be along the lines of having another array (as default with all numbers), and match the posted array against the default, replacing a non existent extry with a comma, but I just don't know the code 🙂

It's the best way to fix this thing as i can see (the explode goes wierd applying a $sel (checked) value to checkboxes if the total length of the array doesn't equal the number of checkboxes).
Thanks for any help in advance.

[Anon]

I've tried this, it doesn't work, but I think i'm close.

for($i = 1; $i <= sizeof($optionSort); $i++)
foreach ($optionSort as $i) {
if ($optionSort[$i] = $i) { $optionSort[$i] = ("$i,"); } else { $optionSort = (","); }
}

[Anon]

what's the inverse of in_array?
!in_array doesn't work
and an if/else statement with it bombs.

    for($i = 1; $i <= sizeof($optionText); $i++) {
      if (in_array("$i", $optionSort)); { 
          $optionSort[$i] = "$i,"; 
          }
      if (!in_array("1", $optionSort)); {
          $optionSort[1] = ",";
          }
      if (!in_array("3", $optionSort)); {
          $optionSort[3] = ",";
          }
    echo "$optionSort[$i]";
    }

[Anon]

I figured it out:- (really simple in the end)

for($i = 1; $i <= sizeof($optionText); $i++) {
if (isset($optionSort[$i])) { $optionSort[$i] = "$i,"; } else { $optionSort[$i] = ","; }
echo "$optionSort[$i]";
}

However, also found out, this wasn't the problem, it was the implode that is losing the comma. So again, back to the brawing board.