Group PHP results on first letter of name

Question

I have a query which gets all records ordered by last_name. Now I would like to create a loop that groups these results by the first letter of the last name and display the

Answer 1

Allready tried something like this?

$last = '';
foreach($data as $key=>$row){
    if(substr($row['last_name'],0,1)!=$last) echo '

'.substr($row['last_name'],0,1).'
----------------
';
    $last = substr($row['last_name'],0,1);
    echo $row['last_name'];
}