PHP Functions in postbit?

[Mink_]

Alright, this question might have been answered before, or it might be obvious... either way, go easy on me. I'm a bit new to this.

How might one go about running a php function inside of the postbit?
I have a tested and working function inside of functions.php that I want to call into my postbit that I'll post hee, just for the hell of it:

This was added after the comments at the end of functions.php with info on when the file was downloaded and such:

class rpgstats
{
  function showstats($userid)
  {
    $question = "SELECT *
    FROM inferno_user
    WHERE rid = $userid
    ORDER BY rid DESC
    LIMIT 1";
    $query = mysql_query($question);
    while($themember = mysql_fetch_object($query))
    {

      // Steal variables from Inferno ;)

      $hp  = $themember->hp;
      $hpm = $themember->hpm;
      $hpa = $hp/$hpm;
      $hpa = $hpa*100;

      $themember->hpd = $hpa;

      $mp  = $themember->mp;
      $mpm = $themember->mpm;
      $mpa = $mp/$mpm;
      $mpa = $mpa*100;

      $themember->mpd = $mpa;

      $def  = $themember->def;
      $defm = $hpm;
      $defa = $def/$defm;
      $defa = $defa*100;

      $themember->defd = $defa;

      $str  = $themember->str;
      $strm = $hpm;
      $stra = $str/$strm;
      $stra = $stra*100;

      $themember->strd = $stra;

      if($themember->strd > 100) {
        $themember->strd=100;
      }

      if($themember->defd > 100)  {
        $themember->defd=100;

      echo"
      <div class='userinfo' align='left'><img src='Inferno/bars/bar_red.gif' width='{$themember->hpd}%' height='16' alt='HP ({$themember->hp}/{$themember->hpm})'></div>
      <div class='userinfo' align='left'><img src='Inferno/bars/bar_blue.gif' width='{$themember->mpd}%' height='16' alt='MP ({$themember->mp}/{$themember->mpm})'></div>
      <div class='userinfo' align='left'><img src='Inferno/bars/bar_purple.gif' height='16' width='{$themember->strd}%' alt='STR ({$themember->str})'></div>
      <div class='userinfo' align='left'><img src='Inferno/bars/bar_green.gif' height='16' width='{$themember->defd}%' alt='DEF ({$themember->def})'></div>
      ";

      }
    }
  }
}

$rpg = new rpgstats;

?>

And then, I try to call it in my post bits like so:

{$rpg->showstats($post[postid]);}

Needless to say, it doesn't work. What am I doing wrong? :speechless:
Sorry for being such a newb.