Returns (a certain range of) the overview of the currently selected newsgroup. selected newsgroup
$first - first article number, start of the range
$last - last article number, end of the range
array - a nested array indicated by the message id of the article, every entry contains the header as array
$msgs[message_id][headername] = headercontent
This function can not be called statically.
Be careful with choosing the range. It could requires some time to get a huge number of message headers.
Example 54-1. Using getOverview()