Comma list

There are several possibilities. Try this:

$output = NULL;
foreach (element_children($element) as $key) {
  $output .= ($output==NULL) ? '' : ', ';
  if ($element[$key]['#item']) {
    $output .= $element[$key]['#item']['value'];
  }
}
return $output;

almost exactly what I'm looking for, but how do I incorporate something like http://drupal.org/node/700480 to get the Value for the key?

I couldn't figure out my last question (still would like to know) but since I only had 1 key!=value I used a quick compare statement.

Anyway, I wanted a "collapsed" list of values using dashes for ranges, and commas. This works:

$output = NULL;
$last = NULL;
$punc = NULL;
foreach (element_children($element) as $key) {
  if ($output==NULL) {
    $output .= ($element[$key]['#item']['value']==0) ? 'K' : $element[$key]['#item']['value'];
    $last = $element[$key]['#item']['value'];
  } elseif ($element[$key]['#item']['value']==($last+1)) {
    //$output .= '(' . $element[$key]['#item']['value'] . ')';
    $last = $element[$key]['#item']['value'];
    $punc = '-';
  } else {
    if ($punc) { $output.= $punc  . $last; }
    $output .= ', ' . $element[$key]['#item']['value'];
    $last = $element[$key]['#item']['value'];
    $punc = NULL;
  }
}

if ($punc) { $output .= $punc . $last; }

return $output;

There's probably a more elegant solution but it works.

Oddly enough my code works well in the regular cck display in a node, but from a view two things happened:

1) each individual element would print K,1,2,3,4,5 in order across subsequent rows. I ensured my Formatter is selected. Oddly, I have to check "Group multiple values" and it uses the formatter (or perhaps it's doing it itself, not sure).

2) Now it correctly outputs as my formatter "K-5" BUT it uses