Integer division in PHP generates zero - how to make it float?

In Russian card game I'm trying to save statistics on how often the player swears (says "bad words" - and we have a lot of them in Russian) in the following PostgreSQL table:

# select * from pref_chat order by swear desc;
           id            | swear | lines
-------------------------+-------+-------
 OK194281930260          |     3 |   153
 OK350321778615          |     2 |   127
 DE12770                 |     2 |   339
 OK122898831181          |     2 |    63
 OK349829847011          |     2 |   126
 OK215240745969          |     1 |    66
 OK459742722980          |     1 |    96

      

        
        
        
      

    

And I need to create an integer of this data - from 1 to 100 (overflow is ok) - so that I can create the following "swear'o'meter":

So, I'm trying (as of PHP 5.3 on CentOS 6.2):

    $sth = $db->prepare('select swear, lines from pref_chat where id=?');
    $sth->execute(array($id));
    if ($row = $sth->fetch(PDO::FETCH_ASSOC)) {
            $quotient = 100 * floor(20 * $row['swear'] / (1 + $row['lines']));
            print('<p><img src="https://chart.googleapis.com/chart?chs=700x100&cht=gom&chco=00FF00,FFFF00,FF0000&chxt=x&chxl=0:|Swearometer&chd=t:' . $quotient . '" width=700 height=100 alt="Swearometer"></p>)';
    }

      

        
        
        
      

    

Unfortunately I get zero because PHP is probably doing "integer division".

I tried adding floor () to $ row ['swear'] and $ row ['lines'] to "throw" them to float, but it didn't help.

UPDATE:

Sorry I had a typo in my original question ... The $ factor is indeed 0, I am printing it out. I've also tried the following, but it's still zero:

$quot = 100 * floor(20 * $row['swear'] / (.1 + $row['lines']));